@article {1089, title = {Pure rotational spectra of LuF and LuCl}, journal = {Physical Chemistry Chemical Physics}, volume = {7}, number = {13}, year = {2005}, note = {ISI Document Delivery No.: 938CUTimes Cited: 8Cited Reference Count: 56}, pages = {2570-2578}, type = {Article}, abstract = {The pure rotational spectra of two isotopic species of LuF and three of LuCl have been measured in the frequency range 5-17 GHz using a cavity pulsed jet Fourier transform microwave spectrometer. The samples were prepared by laser ablation of Lu metal in the presence of SF6 or Cl-2, and stabilized in supersonic jets of Ar. Spectra of molecules in states having v = 0, 1, and 2 have been measured, to produce rotational constants and centrifugal distortion constants, along with hyperfine constants for all the nuclei. Dunham-type. fits for LuCl produced a Born-Oppenheimer breakdown parameter for Cl. Although a theoretical calculation showed that Lu in LuCl should have a significant field shift effect parameter, it could not be determined from the spectrum. Equilibrium internuclear distances, re, and dissociation energies have been evaluated for both molecules. The nuclear quadrupole coupling constants are discussed in terms of the molecular electronic structure.}, keywords = {BORN-OPPENHEIMER APPROXIMATION, DIATOMIC-MOLECULES, DUNHAM COEFFICIENTS, FIELD SHIFT, HYPERFINE CONSTANTS, ISOTOPE DEPENDENCE, METAL-POOR, NEUTRON-CAPTURE ELEMENTS, NUCLEAR-CHARGE RADII, TRANSFORM MICROWAVE SPECTROSCOPY}, isbn = {1463-9076}, url = {://000229978300005}, author = {Cooke, S. A. and Krumrey, C. and Gerry, M. C. L.} } @article {824, title = {The rotational spectrum, nuclear field shift effects, Pt-195 nuclear spin-rotation constant, and electric dipole moment of PtSi}, journal = {Journal of Molecular Spectroscopy}, volume = {223}, number = {2}, year = {2004}, note = {ISI Document Delivery No.: 771HGTimes Cited: 11Cited Reference Count: 52}, month = {Feb}, pages = {185-194}, type = {Article}, abstract = {The pure rotational spectrum of the X(1)Sigma(+) ground electronic state of platinum monosilicide has been measured for nine isotopomers. For the most abundant isotopomer, (PtSi)-Pt-194-Si-28, the J = 1-0 and the J = 2-1 transitions were recorded up to the fourth vibrationally excited state. The data set obtained enabled a multi-isotopomer fit to a Dunham-type expression and the constants Y-01, Y-02, Y-11, Y-21, and Y-31 were determined. In the process of fitting the data it was necessary to include Born-Oppenheimer breakdown correction terms and the values and significance of these terms are discussed. Strong evidence is presented indicating within the rotational spectrum the presence of field shift effects due to the finite size of the Pt nucleus. The nuclear spin-rotation constant, C-I(Pt-195) is found to be 30.98(157)kHz in the ground vibrational state. Hyperfine structure arising from the Si-29 nucleus was not observed. The measurement of Stark shifts in the rotational spectrum of PtSi has enabled the determination of the dipole moments for the (PtSi)-Pt-194-Si-28 and (PtSi)-Pt-196-Si-28 isotopomers. Published by Elsevier Inc.}, keywords = {BORN-OPPENHEIMER APPROXIMATION, CHARGE RADII, DEPENDENCE, DIATOMIC-MOLECULES, DUNHAM COEFFICIENTS, EXCHANGE, HYPERFINE CONSTANTS, ISOTOPE, STATES, TRANSFORM MICROWAVE SPECTROSCOPY, WAVE SPECTRA}, isbn = {0022-2852}, url = {://000188779100010}, author = {Cooke, S. A. and Gerry, M. C. L. and Brugh, D. J. and Suenram, R. D.} } @article {725, title = {The pure rotational spectra of the lanthanum monohalides, LaF, LaCl, LaBr, LaI}, journal = {Journal of Molecular Spectroscopy}, volume = {218}, number = {2}, year = {2003}, note = {ISI Document Delivery No.: 673YVTimes Cited: 13Cited Reference Count: 51}, month = {Apr}, pages = {169-179}, type = {Article}, abstract = {Pure rotational spectra have been measured for all the major isotopomers of the lanthanum monohalides, LaF, LaCl, LaBr, and LaI, in their ground and (except for (LaBr)-Br-81) excited vibrational states. The spectra were observed with a cavity pulsed jet Fourier transform microwave spectrometer in the frequency range 5-24 GHz. The molecules were prepared by laser ablation of La metal and allowing the resulting plasma to react with SF6, Cl-2, Br-2, or CH3I precursor in an Ar carrier gas of the pulsed jet. For LaBr this is the first reported spectrum of any kind. Rotational constants, centrifugal distortion constants, nuclear quadrupole coupling constants, and nuclear spin-rotation constants have been determined for all the molecules. Accurate equilibrium (r(e)) internuclear distances have given an indication of where the Born-Oppenheimer approximation is beginning to fail. From the centrifugal distortion constants and vibration-rotation (alpha(e)) constants good estimates of the harmonic vibration frequencies and bond dissociation energies have been obtained. The halogen nuclear quadrupole coupling constants indicate the molecules to be highly ionic. (C) 2003 Elsevier Science (USA). All rights reserved.}, keywords = {CONSTANTS, DOUBLE-RESONANCE, ELECTRONIC-STRUCTURE, HYPERFINE-STRUCTURE, laser spectroscopy, MOLECULAR-BEAM, MONOIODIDE, NUCLEAR-QUADRUPOLE MOMENT, RF, STATES, TRANSFORM MICROWAVE SPECTROSCOPY}, isbn = {0022-2852}, url = {://000182609600003}, author = {Rubinoff, D. S. and Evans, C. J. and Gerry, M. C. L.} } @article {3572, title = {ROTATIONAL SPECTRA OF THE MIXED RARE-GAS DIMERS NE-KR AND AR-KR}, journal = {Journal of Chemical Physics}, volume = {103}, number = {8}, year = {1995}, note = {ISI Document Delivery No.: RP715Times Cited: 29Cited Reference Count: 40}, month = {Aug}, pages = {2827-2833}, type = {Article}, abstract = {Pure rotational spectra of several isotopomeric species of the rare gas dimers Ne-Kr and Ar-Kr have been measured using a pulsed jet cavity microwave Fourier transform spectrometer. Equilibrium internuclear distances have been evaluated by taking advantage of the isotopic data, for both these dimers and three Xe-containing dimers, whose spectra were reported earlier [Jager et al., J. Chem. Phys. 99, 919(1993)]. The dipole moments have been estimated using the {\textquoteright}{\textquoteright}pi/2-pulse{\textquoteright}{\textquoteright} excitation condition. Kr-83 nuclear quadrupole hyperfine structure has been observed in some rotational transitions of Ne-20-Kr-83 and of Ar-Kr-83, and the corresponding quadrupole coupling constants have been derived. (C) 1995 American Institute of Physics.}, keywords = {CONSTANTS, DEPENDENCE, DIATOMIC-MOLECULES, DUNHAM COEFFICIENTS, EXCITED-STATES, FABRY-PEROT CAVITY, ISOTOPE, POTENTIALS, TRANSFORM MICROWAVE SPECTROSCOPY, ULTRAVIOLET-LASER SPECTROSCOPY, XE}, isbn = {0021-9606}, url = {://A1995RP71500006}, author = {Xu, Y. J. and Jager, W. and Djauhari, J. and Gerry, M. C. L.} } @article {3065, title = {PURE ROTATIONAL SPECTRUM OF, AND POTENTIAL-ENERGY SURFACE FOR, THE AR-N-2 VAN-DER-WAALS COMPLEX}, journal = {Faraday Discussions}, volume = {97}, year = {1994}, note = {ISI Document Delivery No.: QB093Times Cited: 22Cited Reference Count: 84Meeting on Structure and Dynamics of Van der Waal ComplexesAPR 06-08, 1994DURHAM, ENGLAND}, pages = {105-118}, type = {Proceedings Paper}, abstract = {Pure rotational spectra of three isotopomers of the Van der Waals complex Ar-N-2 have been investigated in the frequency range 3.5-20 GHz, using a pulsed molecular beam cavity microwave Fourier-transform spectrometer. Rotational constants and quartic and sextic centrifugal distortion constants have been obtained, along with N hyperfine constants. The spectra of Ar-N-14(2) and Ar-N-15(2) indicate equivalence of the nitrogen nuclei, and thus confirm C-2v symmetry for the complexes. The measured transition frequencies and the derived constants have been used to test the best available literature potential-energy surfaces for the Ar-N-2 interaction. For this purpose rotational transition frequencies and expectation values of other properties were calculated and compared with the corresponding values from the microwave experiments. A refined version of one of the surfaces has been generated by inclusion of the microwave results.}, keywords = {AR, CALCULATIONS, ELASTIC-SCATTERING MEASUREMENTS, FOCK SCF, INFRARED-SPECTRUM, INTER-MOLECULAR FORCES, INTERMOLECULAR FORCES, N2-AR, RANGE DISPERSION COEFFICIENTS, TRANSFORM MICROWAVE SPECTROSCOPY, VANDERWAALS MOLECULES}, isbn = {0301-7249}, url = {://A1994QB09300009}, author = {Jager, W. and Gerry, M. C. L. and Bissonnette, C. and McCourt, F. R. W.} } @article {2834, title = {PURE ROTATIONAL SPECTRA OF THE MIXED RARE-GAS VAN-DER-WAALS COMPLEXES NE-XE, AR-XE, AND KR-XE}, journal = {Journal of Chemical Physics}, volume = {99}, number = {2}, year = {1993}, note = {ISI Document Delivery No.: LM894Times Cited: 48Cited Reference Count: 50}, month = {Jul}, pages = {919-927}, type = {Article}, abstract = {Pure rotational transitions in the vibrational ground states of various isotopomers of the heteronuclear rare gas dimers Ne-Xe, Ar-Xe, and Kr-Xe have been measured using a pulsed molecular beam cavity microwave Fourier transform spectrometer. Rotational and centrifugal distortion constants have been obtained, and have yielded estimates of the lengths of the van der Waals bonds and of their harmonic vibration frequencies. Effects due to nuclear quadrupole coupling have been observed in Xe-131-containing complexes and have yielded the corresponding nuclear quadrupole coupling constants. The electric molecular dipole moments of the complexes have been estimated from the excitation pulse lengths, optimized for maximum signal strength (pi/2 condition).}, keywords = {ARGON, CONSTANTS, curve, DIPOLE-MOMENTS, EXCITED-STATES, INTERATOMIC POTENTIALS, PAIRS, SPECTROMETER, TRANSFORM MICROWAVE SPECTROSCOPY, ULTRAVIOLET-LASER SPECTROSCOPY}, isbn = {0021-9606}, url = {://A1993LM89400017}, author = {Jager, W. and Xu, Y. J. and Gerry, M. C. L.} }