@article {1365, title = {Low-N lines of the A(6)Sigma(+)-X-6 Sigma(+) (1,0) band of CrH}, journal = {Physical Chemistry Chemical Physics}, volume = {8}, number = {7}, year = {2006}, note = {ISI Document Delivery No.: 019BRTimes Cited: 3Cited Reference Count: 20}, month = {Feb}, pages = {822-826}, type = {Article}, abstract = {{The (1,0) band of the A(6)Sigma(+) - X-6 Sigma(+) electronic transition of CrH has been observed by laser-induced fluorescence following the reaction of laser-ablated Cr atoms with methanol under supersonic free-jet cooled conditions. Rotational assignments of the levels with N <= 3 have been made by combination differences and dispersed fluorescence experiments on selected lines. These assignments complement those made from previously-recorded Fourier transform emission spectra, in which higher-N lines were assigned. The low-N rotational levels are extensively perturbed, presumably by levels of the a(4)Sigma(+)}, keywords = {LASER MAGNETIC-RESONANCE, SPECTRUM, STATE, SYSTEM, TRANSFORM EMISSION-SPECTROSCOPY, TRANSITION}, isbn = {1463-9076}, url = {://000235811100004}, author = {Chowdhury, P. K. and Merer, A. J. and Rixon, S. J. and Bernath, P. F. and Ram, R. S.} } @article {968, title = {Nuclear hyperfine structure in the X-3 Sigma(+) state of (ZrC)-Zr-91}, journal = {Journal of Molecular Spectroscopy}, volume = {228}, number = {2}, year = {2004}, note = {ISI Document Delivery No.: 869ESTimes Cited: 5Cited Reference Count: 43}, month = {Dec}, pages = {554-564}, type = {Article}, abstract = {{Electronic band systems of zirconium monocarbide, ZrC, in the 16000-19000cm(-1) region have been observed following the reaction of laser-ablated Zr atoms with methane under supersonic free-jet conditions. Rotational analyses of high-resolution spectra have shown that the ground state of ZrC is a (3)Sigma state, with r(0) = 1.8066 Angstrom and an unexpectedly small spin-spin parameter}, keywords = {BAND SYSTEMS, ELECTRONIC-TRANSITIONS, GROUND-STATE, laser spectroscopy, MONOCARBIDE, OPTICAL SPECTROSCOPY, REGION, RHC, ROTATIONAL ANALYSIS, SPECTRUM}, isbn = {0022-2852}, url = {://000224966800026}, author = {Rixon, S. J. and Chowdhury, P. K. and Merer, A. J.} } @article {690, title = {New vibrational assignments in the (A)over-tilde(1) A(u)-(X)over-tilde (1)Sigma(+)(g) electronic transition of acetylene, C2H2: the nu({\textquoteright})(1) frequency}, journal = {Molecular Physics}, volume = {101}, number = {4-5}, year = {2003}, note = {ISI Document Delivery No.: 657RRTimes Cited: 9Cited Reference Count: 27}, pages = {663-673}, type = {Article}, abstract = {New laser-induced fluorescence spectra of supersonic jet cooled acetylene (C2H2) in the wavelength region 230-205 nm have led to an improved understanding of the vibrational structure of the (A) over tilde (1)A(u) state. Among the new bands observed are two weak perturbed bands at 46008 cm(-1) and 46116 cm(-1). Rotational analyses of these bands, together with the corresponding {\textquoteright}hot{\textquoteright} bands arising from the ground state v(4) fundamental, have shown that the upper states have asymmetric top K structure that is unaffected by a axis Coriolis coupling; this means that they do not involve overtones of the low frequency bending vibrations and therefore must be combinations of a(g) vibrational normal modes. From their positions in the manifold, their vibrational assignments can only be 2(0)(2)3(0)(1) and 1(0)(1)3(0)(1). These assignments lead to values of x(22){\textquoteright}, x(13){\textquoteright}, and a revised value for the symmetric CH stretching frequency, v(1){\textquoteright} = 2880.5 cm(-1); this revised value is 160 cm(-1) lower than the previously accepted value, but consistent with new ab initio calculations that we performed at the EOM-CCSD level using a TZ2P ( triple-zeta plus double polarization) basis set.}, keywords = {BANDS, MODES, PARTIAL DEPERTURBATION, ROTATION CONSTANTS, SPECTROSCOPY, SPECTRUM, STATE, WAVELENGTH, X BAND SYSTEM}, isbn = {0026-8976}, url = {://000181680600017}, author = {Merer, A. J. and Yamakita, N. and Tsuchiya, S. and Stanton, J. F. and Duan, Z. C. and Field, R. W.} } @article {5216, title = {Fourier transform microwave spectroscopy of cyanides and isocyanides of Al, Ga, and In}, journal = {Journal of Molecular Spectroscopy}, volume = {209}, number = {2}, year = {2001}, note = {ISI Document Delivery No.: 490JPTimes Cited: 22Cited Reference Count: 44}, month = {Oct}, pages = {178-191}, type = {Article}, abstract = {Microwave spectra of the three Group 13 metal cyanide pairs AlNC/AlCN, GaNC/GaCN, and InNC/InCN have been measured in the frequency range 6-25 GHz using a pulsed jet cavity Fourier transform microwave spectrometer. The molecules were prepared by ablating the metal with a pulsed Nd:YAG laser and allowing the vapor to react with cyanogen or acetonitrile contained in the Ar backing gas of the jet. The spectra are those of linear molecules. Rotational constants. centrifugal distortion constants. and nuclear quadrupole coupling constants have been precisely evaluated. Molecular geometries determined from the rotational constants using a linear model have revealed unexpectedly short NC bond lengths for the isocyanides, MNC, and are interpreted in terms of a broadened potential well for the bending mode of these molecules. This interpretation is confirmed with ab initio calculations. The centrifugal distortion constants are consistent with this picture. A new formulation of the rigid bender model has produced plausible values for bond lengths and bending amplitudes for the isocyanides. The N-14 quadrupole coupling constants are discussed in terms of the approximate bending amplitudes. A description of the bonding in the molecules has been obtained using Townes-Dailey theory. (C) 2001 Academic Press.}, keywords = {aluminum, ATOMS, CORRELATED MOLECULAR CALCULATIONS, EQUILIBRIUM, GAUSSIAN-BASIS SETS, IRC+10216, MONOCYANIDES, PARAMETERS, SPECTRUM, STRUCTURE, TRENDS}, isbn = {0022-2852}, url = {://000172049000004}, author = {Walker, K. A. and Evans, C. J. and Suh, S. H. K. and Gerry, M. C. L. and Watson, J. K. G.} } @article {5217, title = {Microwave spectra, geometries, and hyperfine constants of OCCuX (X = F, Cl, Br)}, journal = {Inorganic Chemistry}, volume = {40}, number = {24}, year = {2001}, note = {ISI Document Delivery No.: 492RMTimes Cited: 14Cited Reference Count: 45}, month = {Nov}, pages = {6158-6166}, type = {Article}, abstract = {A pulsed jet cavity Fourier transform microwave spectrometer has been used to measure the rotational spectra of OCCuX (X = F, Cl, Br) in the frequency range 5-21 GHz. Metal atoms were generated via laser ablation and were allowed to react with CO and a halide precursor, prior to stabilization of the products within a supersonic jet. These are the first experimental observations of OCCuF and OCCuBr and the first high-resolution spectroscopic study of gas-phase OCCuCl. All three molecules were found to be linear. Rotational constants, centrifugal distortion constants, nuclear quadrupole coupling constants, and nuclear spin-rotation coupling constants have been precisely determined. The rotational constants have been used to evaluate the various bond lengths, and the results are in good agreement with the trend established for OCAuX species. The C-O distance is found to be comparatively short and close to that of free CO. The M-C distance is longer than that predicted by ab initio calculations, and the Cu-X distances are very similar to those observed in the corresponding metal halides. Vibrational wavenumbers have been estimated from the distortion constants and are compared with the results of various ab initio studies. Changes in the Cu, Cl, and Br nuclear quadrupole coupling constants indicate that substantial charge rearrangement takes place on coordination with CO, consistent with the formation of strong Cu-C bonds. Mulliken orbital population analyses have been performed and provide evidence of pi -back-donation from Cu in all of the species studied. The evaluated nuclear spin-rotation coupling constants have been used to estimate the Cu-63 nuclear shielding constants, sigma, and their spans (Omega) in (OCCuF)-Cu-63, (OCCuCl)-Cu-63-Cl-35, and (OCCuBr)-Cu-63-Br-79.}, keywords = {2ND, ATOMS, COMPLEXES, CORRELATED MOLECULAR CALCULATIONS, CU(CO)CL, GAUSSIAN-BASIS SETS, ROTATIONAL, SPECTRUM}, isbn = {0020-1669}, url = {://000172181400012}, author = {Walker, N. R. and Gerry, M. C. L.} } @article {4834, title = {High-resolution spectroscopy of jet-cooled (SO2)-S-32 and (SO2)-S-34: The (a)over-tilde(3)B(1)-(X)over-tilde(1)A(1), 2(0)(1) and 1(0)(1) bands}, journal = {Journal of Molecular Spectroscopy}, volume = {203}, number = {1}, year = {2000}, note = {ISI Document Delivery No.: 347WMTimes Cited: 5Cited Reference Count: 20}, month = {Sep}, pages = {151-157}, type = {Article}, abstract = {Laser-induced excitation spectra of the two bands (a) over tilde(3)B(1)-(X) over tilde(1)A(1), 2(0)(1) and 1(0)(1) of (SO2)-S-32 and (SO2)-S-34 have been recorded in a supersonic jet at a resolution of 0.015 cm(-1). The rotational and electron-spin fine structure has been analyzed for both isotopic species. Analysis of the rotational and electron-spin fine structure yields precise values of the rotational constants A, B, and C and the spin constants alpha and beta for both (SO2)-S-32 and (SO2)-S-34 in the states (a) over tilde(3)B(1) (010) and (100). No interaction between these two vibrational States with any nearby triplet state is observed for rotational levels with J less than or equal to 8 and K less than or equal to 2. (C) 2000 Academic Press.}, keywords = {ABSORPTION, AMPLIFIED SPONTANEOUS EMISSION, ROTATIONAL STRUCTURE, SO2, SPECTRUM, STATE, STIMULATED BRILLOUIN-SCATTERING, sulfur dioxide, SULFUR-DIOXIDE, SYSTEM}, isbn = {0022-2852}, url = {://000088952200018}, author = {Huang, C. L. and Ju, S. S. and Chen, I. C. and Merer, A. J. and Ni, C. K. and Kung, A. H.} } @article {4795, title = {Noble gas-metal chemical bonds. Microwave spectra, geometries, and nuclear quadrupole coupling constants of Ar-AuCl and Kr-AuCl}, journal = {Journal of the American Chemical Society}, volume = {122}, number = {25}, year = {2000}, note = {ISI Document Delivery No.: 332CBTimes Cited: 70Cited Reference Count: 41}, month = {Jun}, pages = {6100-6105}, type = {Article}, abstract = {The pure rotational spectra of Ar-AuCl and Kr-AuCl have been measured using a pulsed-jet cavity Fourier transform microwave spectrometer. Both complexes have been found to be linear and are relatively rigid in their ground vibrational states. The noble gas-gold stretching frequencies have been estimated to be 198 and 161 cm(-1) for Ar-AuCl and Kr-AuCl, respectively. From the isotopic data obtained. ro structures have been calculated for both Ar-AuCl and Kr-AuCl, while a partial substitution (r(s)) structure has been obtained for Kr-AuCl. The Ar-Au distance has been found to be 2.47 Angstrom, while the Kr-Au distance is 2.52 Angstrom. Ab initio calculations have been performed at the MP2 level of theory on both complexes to obtain geometries, vibrational frequencies, and dissociation energies. The dissociation energies for Ar-AuCl and Kr-AuCl have been estimated to be 47 and 71 kJ mol(-1), respectively. The nuclear quadrupole coupling constant of Au has been found to change significantly on complex formation (to -259.8 MHz in Ar-AuCl, and -349.9 MHz in Kr-AuCl) from its value in the monomer unit (+9.6 MHz in AuCl), which is consistent with extensive charge rearrangement on formation of the complexes. This, in conjunction with the sizable dissociation energies, indicates that the Ar-Au and Kr-Au bonds are weakly covalent.}, keywords = {ARGON, ATOMS, CORRELATED MOLECULAR CALCULATIONS, DER-WAALS COMPLEXES, FOURIER-TRANSFORM SPECTROSCOPY, GAUSSIAN-BASIS SETS, LASER-ABLATION, RAMAN, ROTATIONAL, SPECTRUM, STATES}, isbn = {0002-7863}, url = {://000088054900021}, author = {Evans, C. J. and Lesarri, A. and Gerry, M. C. L.} } @article {4668, title = {Comment on "Fine and magnetic hyperfine structure in the A(2)Pi and X-2 Sigma(+) states of yttrium monoxide"}, journal = {Journal of Chemical Physics}, volume = {111}, number = {13}, year = {1999}, note = {ISI Document Delivery No.: 238UWTimes Cited: 5Cited Reference Count: 14}, month = {Oct}, pages = {6148-6149}, type = {Letter}, keywords = {BAND, SPECTRUM, ZRN}, isbn = {0021-9606}, url = {://000082732100057}, author = {Simard, B. and Watson, J. K. G. and Merer, A. J. and Steimle, T. C.} } @article {4690, title = {F-19 nuclear spin-rotation constant of yttrium monofluoride}, journal = {Journal of Molecular Spectroscopy}, volume = {198}, number = {1}, year = {1999}, note = {ISI Document Delivery No.: 246JGTimes Cited: 11Cited Reference Count: 22}, month = {Nov}, pages = {183-185}, type = {Article}, keywords = {HALIDES, LASER-ABLATION, MOLECULAR-BEAM, PUMP PROBE, SPECTROSCOPY, SPECTRUM, SRF, STATE}, isbn = {0022-2852}, url = {://000083160200019}, author = {Walker, K. A. and Gerry, M. C. L.} } @article {4581, title = {High-resolution fourier transform infrared spectroscopy of vinyl alcohol: Rotational analysis of the nu(13) CH2 wagging fundamental at 817 cm(-1)}, journal = {Journal of Molecular Spectroscopy}, volume = {197}, number = {1}, year = {1999}, note = {ISI Document Delivery No.: 230KFTimes Cited: 11Cited Reference Count: 17}, month = {Sep}, pages = {68-75}, type = {Article}, abstract = {The first high-resolution infrared spectra of the unstable molecule vinyl alcohol are reported. The spectra have been obtained using a new precursor, 2-chloroethanol, which when pyrolyzed at 1050 degrees C gives strong infrared spectra of vinyl alcohol free of interfering hydrocarbon absorption bands. In this work, we have analyzed the strong v(13) fundamental at 817 cm(-1) and substantially improved the ground state rotational constants by a simultaneous fitting of previous microwave data and a large number of infrared combination differences. The 13(1) upper state was found to be perturbed by the 15(2) "dark" state at 775.7 cm(-1), and a complete analysis of the perturbed rotational structure has been achieved using an interacting two-state model. Further small perturbations at high K-a, and J have been identified as interactions with the v(10) and v(12) fundamentals at 948 and 960 cm(-1), respectively. (C) 1999 Academic Press.}, keywords = {BAND, DARK STATES, INTERACTING BRIGHT, MOLECULAR-CONSTANTS, SPECTRUM}, isbn = {0022-2852}, url = {://000082249800009}, author = {Joo, D. L. and Merer, A. J. and Clouthier, D. J.} } @article {4691, title = {Laboratory microwave spectroscopy of aluminium cyanide}, journal = {Chemical Physics Letters}, volume = {301}, number = {1-2}, year = {1999}, note = {ISI Document Delivery No.: 167XUTimes Cited: 10Cited Reference Count: 23}, month = {Feb}, pages = {200-204}, type = {Article}, abstract = {The pure rotational spectrum of aluminium cyanide (AlCN) between 10 and 21 GHz has been investigated by Fourier transform microwave spectroscopy. Molecular samples were produced by reacting ablated Al metal with cyanogen present in an Ar supersonic jet. Rotational and centrifugal distortion constants and Al-27 and N-14 nuclear quadrupole coupling constants and nuclear spin-rotation constants have been determined for the main isotopomer, (AlCN)-Al-27-C-12-N-14. The spectrum of AlCN was found to be much weaker than that of AlNC thus confirming that AlCN is the less stable of the two isomers. (C) 1999 Elsevier Science B.V. All rights reserved.}, keywords = {ALF, ALNC, CONSTANTS, IRC+10216, ISOCYANIDE, MOLECULES, NACN, SPECTRUM, TRENDS}, isbn = {0009-2614}, url = {://000078660800029}, author = {Walker, K. A. and Gerry, M. C. L.} } @article {4371, title = {The forbidden rotational Q-branch of CH3CF3: Torsional properties and (A(1)-A(2)) splittings}, journal = {Journal of Molecular Spectroscopy}, volume = {190}, number = {2}, year = {1998}, note = {ISI Document Delivery No.: 103JBTimes Cited: 8Cited Reference Count: 29}, month = {Aug}, pages = {324-340}, type = {Article}, abstract = {The pure rotational spectrum driven by the small distortion dipole moment perpendicular to the symmetry axis has been investigated between 8 and 18 GHz for CH3CF3 in the ground vibrational state using a pulsed Fourier transform waveguide spectrometer. This molecule has been selected as a prototype for the case of a symmetric top with small (similar to 500 kHz) torsional energy splittings in the ground torsional state (v(6) = 0). In this state, six (k +/- 3 <{\textendash} k) e-branch series have been measured for lower state K = \k\ between 3 and 8 with 27 less than or equal to J less than or equal to 75, For (v(6) = 1), three series with lower state K between 5 and 7 with 49 less than or equal to J less than or equal to 66 have been observed. In two of these series, the torsional fine structure extending over similar to 6.8 MHz has been fully resolved. The (A(1) - A(2)) splitting has been measured in the (v(6) = 0) series (K = 6 <{\textendash} 3) for 37 less than or equal to J less than or equal to 74. The global data set of 443 frequencies included avoided-crossing molecular-beam splittings of Meerts and Ozier (1991. Chem. Phys. 152, 241-259) and mm-wave R-branch measurements of Bocquet et nl. (1994. J, Mol. Spectrosc. 165, 494-499). In a weighted least-squares analysis, a good fit was obtained by varying 18 parameters in a Hamiltonian that represented both the torsional effects and the sextic splittings. Effective values have been determined for both rotational constants, eight torsional parameters including the barrier height, six diagonal centrifugal distortion constants, and two centrifugal distortion constants (epsilon and epsilon(J)) that characterize the (Delta k = +/-3) matrix elements. The difficulties are discussed that arise in defining a unique model for the torsional terms in the Hamiltonian when a high barrier symmetric top is investigated by distortion moment spectroscopy. The redundancies are investigated that exist in the quartic and sextic Hamiltonian for a near-spherical top such as CH3CF3. (C) 1998 Academic Press.}, keywords = {CH3SIH3, CROSSING MOLECULAR-BEAM, INTERNAL-ROTATION, METHYL SILANE, MICROWAVE FOURIER-TRANSFORM, MILLIMETER-WAVE, POLYATOMIC-MOLECULES, SPECTROSCOPY, SPECTRUM, SYMMETRIC, TOPS}, isbn = {0022-2852}, url = {://000075153100016}, author = {Ozier, I. and Schroderus, J. and Wang, S. X. and McRae, G. A. and Gerry, M. C. L. and Vogelsanger, B. and Bauder, A.} } @article {3238, title = {ELECTRONIC-TRANSITIONS OF COBALT CARBIDE, COC, NEAR 750 NM - A GOOD EXAMPLE OF CASE (B(BETA-S)) HYPERFINE COUPLING}, journal = {Journal of Chemical Physics}, volume = {103}, number = {19}, year = {1995}, note = {ISI Document Delivery No.: TE364Times Cited: 56Cited Reference Count: 48}, month = {Nov}, pages = {8360-8371}, type = {Article}, abstract = {The laser induced fluorescence spectrum of jet-cooled CoC near 750 nm has been measured at high resolution following the reaction of laser-ablated cobalt atoms with methane. The X(2) Sigma(+) ground state of CoC is an unusually good example of Hund{\textquoteright}s case (b(beta S)) coupling. Since Co has a nuclear spin I=7/2, each rotational level is split by the Fermi contact interaction into G=3 and G=4 components, where G=I+S; the splitting for N=0 is more than 0.5 cm(-1). The X(2) Sigma(+) state begins to uncouple toward case (b(beta J)) with increasing rotation. Transitions to various (II)-I-2 excited states occur in the region 13 000-14 500 cm(-1); the most prominent of these (for which high resolution spectra have been recorded) lie at 13 079 cm(-1) ((II3/2)-I-2) and 13 343 cm(-1) ((II1/2)-I-2). The (b(beta S)) coupling in the ground state produces some unexpected hyperfine intensity patterns, which have been studied in detail. A very low-lying (2) Delta(i) state, whose Omega=5/2 and Omega=3/2 components lie at 221 and 1173 cm(-1), has been identified. Laser excitation of the (II3/2)-I-2-(2) Delta(5/2) transition has been observed by monitoring the strong (II3/2)-I-2-X(2) Sigma(+) emission, which has allowed the (2) Delta(5/2) state to be characterized at high resolution. A total of 879 rotational-hyperfine transitions between the various (II1/2)-I-2, (II3/2)-I-2, (2) Delta(5/2), and (2) Sigma(+) states have been assigned and fitted. Matrix elements for a (2) Sigma(+) state in case (bps) coupling are listed. (C) 1995 American Institute of Physics.}, keywords = {GROUND-STATE, laser spectroscopy, MNO, MOLECULES, O, O BAND, RESONANCE, SPECTRUM, SYSTEM, VC}, isbn = {0021-9606}, url = {://A1995TE36400006}, author = {Barnes, M. and Merer, A. J. and Metha, G. F.} } @article {3585, title = {FOURIER-TRANSFORM SPECTROSCOPY OF (CH3OH)-O-18 - THE INPLANE CH3-ROCKING BAND}, journal = {Journal of Molecular Spectroscopy}, volume = {172}, number = {1}, year = {1995}, note = {ISI Document Delivery No.: RG022Times Cited: 15Cited Reference Count: 25}, month = {Jul}, pages = {153-175}, type = {Article}, abstract = {The infrared Fourier transform spectrum of (CH3OH)-O-18 has been recorded in the region from 1020 to 1620 cm(-1) at high resolution in order to study the low-lying bending modes, including the CH3-rocking, OH-bending, and CH3-deformation fundamental bands. More than 10 000 lines have now been assigned in this region. The present paper focuses on the n = 0 ground torsional subbands of the in-plane CH3-rocking fundamental. This band is principally of parallel a-type character, due to mixing of the predominantly parallel CO-stretching and OH-bending coordinates with the perpendicular rocking coordinate. Some b-type character was also observed, with partial assignments of a number of weak perpendicular subbands. The parallel subbands have been fitted to J(J + 1) power-series expansions to obtain the subband origins, as well as compact representations of the data in terms of phenomenological state-specific expansion coefficients. The n = 0 excited state energies calculated from the subband origins follow a similar oscillatory pattern with K to that of the ground vibrational state but with significantly reduced amplitude. Analysis with our basic torsion-rotation Hamiltonian yields an effective torsional barrier height for the rocking state of 474.5 +/- 2.8 cm(-1), a 27\% increase over the ground state value. The vibrational energy is found to be 1058.46 +/- 0.62 cm(-1). An interesting J-localized level-crossing resonance between the CH3-rocking and CO-stretching modes has also been observed through perturbations in the spectrum. (C) 1995 Academic Press, Inc.}, keywords = {CH3OH, METHANOL, MICROWAVE, MOLECULES, ROTATION, SPECTRUM}, isbn = {0022-2852}, url = {://A1995RG02200013}, author = {Zhao, S. B. and Lees, R. M. and Johns, J. W. C. and Chan, C. P. and Gerry, M. C. L.} } @article {3239, title = {ROTATIONAL AND HYPERFINE ANALYSIS OF THE A{\textquoteright}(3)PHI(4)-X(3)PHI(4) TRANSITIONS OF COH AND COD}, journal = {Journal of Molecular Spectroscopy}, volume = {173}, number = {1}, year = {1995}, note = {ISI Document Delivery No.: RU652Times Cited: 14Cited Reference Count: 23}, month = {Sep}, pages = {100-112}, type = {Article}, abstract = {Three new bands of CoH and five new bands of CoD have been observed using laser excitation in the visible and near-infrared, following reaction of Co atoms with H-2 or D-2 under supersonic jet-cooled conditions. All the bands reported here, together with two reported previously by Varberg et al. (J. Mol. Spectrosc. 138, 630-637, 1989), are shown to belong to a single electronic transition with an origin near 12 400 cm(-1), here designated A{\textquoteright}(3) Phi(4)-X(3) Phi(4). High-resolution spectra of the (0, 0) bands of both CoH and CoD reveal extensive hyperfine structure associated with the Co-59 nucleus, which shows that the electron configuration of the A{\textquoteright}(3) Phi state is (7 sigma)(1)(3d delta)(3)(3d pi)(3)(8 sigma)(1). Wavelength-resolved fluorescence from one of the CoD bands has given the Omega = 4-3 spin-orbit interval for the X(3) Phi state as 729 cm(-1) and confirmed the presence of a low-lying Omega = 3 electronic state similar to 2444 cm(-1) above the ground state. (C) 1995 Academic Press, Inc.}, keywords = {GROUND-STATE, laser spectroscopy, MOLECULES, SOLAR IDENTIFICATION, SPECTRUM, SYSTEM}, isbn = {0022-2852}, url = {://A1995RU65200012}, author = {Barnes, M. and Merer, A. J. and Metha, G. F.} } @article {3221, title = {{ROTATIONAL AND HYPERFINE-STRUCTURE IN THE B(4)PI-X(4)SIGMA(-) (0,0) BAND OF VO AT 7900 ANGSTROM - PERTURBATIONS BY THE A(2)SIGMA(+)}, journal = {Journal of Molecular Spectroscopy}, volume = {170}, number = {1}, year = {1995}, note = {ISI Document Delivery No.: QL001Times Cited: 28Cited Reference Count: 37}, month = {Mar}, pages = {94-130}, type = {Article}, abstract = {{The (0,0) band of the (BII)-I-4-X(4) Sigma(-) system of VO near 7900 Angstrom has been analyzed from Doppler-limited Fourier transform emission spectra, together with wavelength-resolved laser-induced fluorescence and sub-Doppler intermodulated fluorescence spectra. The (BII)-I-4}, keywords = {laser spectroscopy, LINEAR MOLECULES, multiplicity, PARAMETERS, QUARTET, RESONANCE, SPECTRUM, STATES}, isbn = {0022-2852}, url = {://A1995QL00100008}, author = {Adam, A. G. and Barnes, M. and Berno, B. and Bower, R. D. and Merer, A. J.} } @article {3125, title = {RADICAL FORMATION DURING THE REACTION OF BIS(FLUOROSULFURYL)PEROXIDE, S2O6F2, WITH TETRASULFUR TETRANITRIDE, S4N4, AND ELEMENTAL SULFUR, S-8}, journal = {Journal of Fluorine Chemistry}, volume = {66}, number = {2}, year = {1994}, note = {ISI Document Delivery No.: MX367Times Cited: 1Cited Reference Count: 46}, month = {Feb}, pages = {147-152}, type = {Article}, abstract = {The radical intermediates formed initially in the reaction of S2O6F2 with S4N4 and S8 have been studied by ESR spectroscopy at X-band level. The transient radical formed in the reaction between S2O6F2 and S4N4 has the spin Hamiltonian parameters g(xx) = 2.0014, g(yy) = 2.0054, g(zz) = 2.0249, A(xx) = 22.5 MHz, A(yy) = 4.5 MHz, A(zz) = 2.0 MHz and Q(zz) = 4 MHz as determined by simulation of ESR lineshapes obtained from polycrystalline samples. The spin Hamiltonian parameters are very similar to those previously reported for [S3N2]+., and the spectra are interpreted as being most likely due to the [S3N2]+. radical. The reaction between S2O6F2 and S8 under similar conditions produces a radical that has a g-tensor of the form g(xx) = 2.0026, g(yy) = 2.0184, g(zz) = 2.0258, as determined by simulation. The transient species generated is postulated to be a similar S5+. radical.}, keywords = {CRYSTAL-STRUCTURE, ELECTRON-SPIN-RESONANCE, HSO3F, NITROGEN, POLYATOMIC CATIONS, S3N2+, SALTS, SPECTRUM}, isbn = {0022-1139}, url = {://A1994MX36700011}, author = {Mistry, F. and Herring, F. G. and Haas, A. and Aubke, F.} } @article {2888, title = {COMPLEX POLYMERIC CATIONS OF COPPER(I) WITH GRAPHITE-RELATED AND DIAMOND-RELATED LATTICES - CRYSTAL-STRUCTURES OF POLY-TRIS(MU-2,5-DIMETHYLPYRAZINE)DICOPPER(I) HEXAFLUOROPHOSPHATE AND POLY-BIS(MU-2,5-DIMETHYLPYRAZINE)COPPER(I) HEXAFLUOROPHOSPHATE}, journal = {Inorganic Chemistry}, volume = {32}, number = {9}, year = {1993}, note = {ISI Document Delivery No.: KZ801Times Cited: 94Cited Reference Count: 47}, month = {Apr}, pages = {1607-1611}, type = {Article}, abstract = {{Yellow crystals of composition [Cu2(2,5-me2pyz)3][PF6]2, 1, and orange-red ones of composition [Cu(2,5-me2-pyz)2] [PF6], 2, were obtained from the reaction Of Cu(ClO4)2-6H2O, KPF6, and 2,5-dimethylpyrazine in ethanol. Single-crystal X-ray diffraction studies on both are reported. Crystals of 1 are monoclinic}, keywords = {cobalt(II), EXCHANGE, LIGANDS, MAGNETIC-PROPERTIES, MOLECULAR-STRUCTURE, NITROGEN-HETEROCYCLES, PERCHLORATE, Pyrazine, SPECTRUM, TRIFLUOROMETHANESULFONATE}, isbn = {0020-1669}, url = {://A1993KZ80100015}, author = {Otieno, T. and Rettig, S. J. and Thompson, R. C. and Trotter, J.} } @article {2888, title = {COMPLEX POLYMERIC CATIONS OF COPPER(I) WITH GRAPHITE-RELATED AND DIAMOND-RELATED LATTICES - CRYSTAL-STRUCTURES OF POLY-TRIS(MU-2,5-DIMETHYLPYRAZINE)DICOPPER(I) HEXAFLUOROPHOSPHATE AND POLY-BIS(MU-2,5-DIMETHYLPYRAZINE)COPPER(I) HEXAFLUOROPHOSPHATE}, journal = {Inorganic Chemistry}, volume = {32}, number = {9}, year = {1993}, note = {ISI Document Delivery No.: KZ801Times Cited: 94Cited Reference Count: 47}, month = {Apr}, pages = {1607-1611}, type = {Article}, abstract = {{Yellow crystals of composition [Cu2(2,5-me2pyz)3][PF6]2, 1, and orange-red ones of composition [Cu(2,5-me2-pyz)2] [PF6], 2, were obtained from the reaction Of Cu(ClO4)2-6H2O, KPF6, and 2,5-dimethylpyrazine in ethanol. Single-crystal X-ray diffraction studies on both are reported. Crystals of 1 are monoclinic}, keywords = {cobalt(II), EXCHANGE, LIGANDS, MAGNETIC-PROPERTIES, MOLECULAR-STRUCTURE, NITROGEN-HETEROCYCLES, PERCHLORATE, Pyrazine, SPECTRUM, TRIFLUOROMETHANESULFONATE}, isbn = {0020-1669}, url = {://A1993KZ80100015}, author = {Otieno, T. and Rettig, S. J. and Thompson, R. C. and Trotter, J.} } @article {2919, title = {F-19 SPIN ROTATION AND SPIN SPIN INTERACTIONS OF SILICON DIFLUORIDE AND GERMANIUM DIFLUORIDE PREPARED IN AN ELECTRIC-DISCHARGE, OBSERVED WITH A CAVITY MICROWAVE FOURIER-TRANSFORM SPECTROMETER}, journal = {Journal of Molecular Spectroscopy}, volume = {158}, number = {2}, year = {1993}, note = {ISI Document Delivery No.: KU191Times Cited: 16Cited Reference Count: 27}, month = {Apr}, pages = {328-338}, type = {Article}, keywords = {GEF2, METHANIMINE, SIF2, SPECTRUM}, isbn = {0022-2852}, url = {://A1993KU19100009}, author = {Styger, C. and Gerry, M. C. L.} } @article {2835, title = {MICROWAVE SPECTROSCOPIC INVESTIGATION OF THE WEAKLY BOUND DIMER CARBON-MONOXIDE CHLORINE, OCCL2}, journal = {Journal of Physical Chemistry}, volume = {97}, number = {15}, year = {1993}, note = {ISI Document Delivery No.: KX596Times Cited: 27Cited Reference Count: 27}, month = {Apr}, pages = {3685-3689}, type = {Article}, abstract = {The rotational spectrum of the van der Waals complex OCCl2 has been observed in the frequency range 5-12 GHz using a cavity-pulsed microwave Fourier transform spectrometer. The isotopomers investigated were (OCCl2)-Cl-35, (OCClCl)-Cl-37-Cl-35, (OCClCl)-Cl-35-Cl-37, (OCCl2)-C-13-Cl-35, (OCClCl)-C-13-Cl-37-Cl-35, (OCClCl)-C-13-Cl-35-Cl-37, and (OCCl2)-O-18-C-13-Cl-35. It is established that the complex is linear in the ground vibrational state, and a complete substitution (r(s)) structure has been obtained. The nuclear quadrupole hyperfine structures due to the Cl-35 and Cl-37 nuclei have been resolved, yielding the corresponding nuclear quadrupole coupling constants. The differences in these constants between the inner and outer Cl nuclei, along with the derived geometry and the relatively low centrifugal distortion constants, are consistent with a picture of a rather rigid complex with a significant charge redistribution in the Cl2 monomer on complexation with CO.}, keywords = {AR, COMPLEXES, CONSTANTS, HF, SIH3NCO, SILYL ISOCYANATE, SPECTRUM}, isbn = {0022-3654}, url = {://A1993KX59600009}, author = {Jager, W. and Xu, Y. J. and Gerry, M. C. L.} } @article {2712, title = {ROTATIONAL, FINE, AND HYPERFINE ANALYSES OF THE (0,0) BAND OF THE D(3)PI-X(3)DELTA SYSTEM OF VANADIUM MONONITRIDE}, journal = {Journal of Chemical Physics}, volume = {99}, number = {5}, year = {1993}, note = {ISI Document Delivery No.: LU722Times Cited: 42Cited Reference Count: 45}, month = {Sep}, pages = {3288-3303}, type = {Article}, abstract = {The VN molecule has been produced in a molecular beam apparatus using a laser vaporization source and its D3PI-X3DELTA (0,0) band has been studied by laser-induced fluorescence at low (approximately 0.1 cm-1) and sub-Doppler resolution (approximately 0.004 cm-1). Lifetimes of single rotational levels of the D3PI0 component have been measured and interpreted. Rotational, fine, and hyperfine structures in six of the nine subbands possible for a 3PI <{\textendash} 3DELTA transition have been recorded. Both states exhibit a rapid transition from case (a) {\textendash}> case (b) coupling cases, manifested by reversals in the Lande patterns of the hyperfine structure. The data have been reduced to a set of 35 molecular constants using a modified case (a(beta)) effective Hamiltonian in which two additional magnetic hyperfine parameters are required for each state. The distortions in the hyperfine structure are due almost entirely to second-order spin-orbit interaction between states arising from the same configuration. Analysis of the derived parameters indicates that the X3DELTA state is well represented by the single electron configuration ... 8sigma2 3pi4 9sigma1 1delta1, in which the 9sigma molecular orbital (MO) is a V 4s-4p hybrid (88\% V 4s) and the 1delta MO is-a pure V 3d orbital; the dominant configuration for the D3PI state is ... 8sigma2 3pi4 1delta1 4pi1, in which the 4pi MO is an antibonding orbital composed of at most 82\% V 3dpi. The isoconfigurational a 1DELTA and e 1PI states are calculated to lie 3390 and 2200 cm-1 above their respective high spin companions. The lambda doubling in the D3PI0 component has been interpreted in terms of spin-orbit interactions with the B3SIGMA- and d1SIGMA+ states, both states arising from the ... 8sigma2 3pi4 1delta2 configuration; the d1SIGMA+ state is known [Simard, Masoni, and Hackett, J. Mol. Spectrosc. 136, 44 (1989)] to lie 102 cm-1 above D3PI0, while the B3SIGMA- state probably lies about 8000 cm-1 below.}, keywords = {ABINITIO, ELECTRONIC EMISSION SYSTEM, MOLECULES, NIOBIUM NITRIDE, PARAMETERS, RESONANCE, SPECTROSCOPY, SPECTRUM, STATES, TIN}, isbn = {0021-9606}, url = {://A1993LU72200017}, author = {Balfour, W. J. and Merer, A. J. and Niki, H. and Simard, B. and Hackett, P. A.} } @article {7133, title = {ELUCIDATION OF ELECTRONIC-STRUCTURE BY THE ANALYSIS OF HYPERFINE INTERACTIONS - THE MNH A 7-PI-X7-SIGMA+ (O,O) BAND}, journal = {Journal of Chemical Physics}, volume = {95}, number = {3}, year = {1991}, note = {ISI Document Delivery No.: GA106Times Cited: 51Cited Reference Count: 34}, month = {Aug}, pages = {1563-1576}, type = {Article}, abstract = {{We present a complete analysis of the hyperfine structure of the MnH A 7-PI-X 7-SIGMA+ (0,0) band near 5680 angstrom, studied with sub-Doppler resolution by intermodulated fluorescence spectroscopy. Magnetic hyperfine interactions involving both the Mn-55 (I = 5/2) and H-1 (I = 1/2) nuclear spins are observed as well as Mn-55 electric quadrupole effects. The manganese Fermi contact interaction in the X 7-SIGMA+ state is the dominant contributor to the observed hyperfine splittings; the DELTA-F = 0}, keywords = {MOLECULES, SPECTROSCOPY, SPECTRUM, STATES, TRANSITION-METAL HYDRIDES}, isbn = {0021-9606}, url = {://A1991GA10600016}, author = {Varberg, T. D. and Field, R. W. and Merer, A. J.} }