@article {4115, title = {Orientational order of 1,3-dichloro-2-ethenylbenzene in liquid crystal solvents}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {75}, number = {8}, year = {1997}, note = {ISI Document Delivery No.: XX043Times Cited: 2Cited Reference Count: 38}, month = {Aug}, pages = {1156-1161}, type = {Article}, abstract = {The order parameter matrices of a molecule that has no symmetry, 1,3-dichloro-2-ethenylbenzene, dissolved in two different nematic liquid-crystal solvents are analyzed in terms of various models for the intermolecular mean-field potential. In a mixture of liquid crystals for which the interaction between the molecular quadrupole moment tensor and the average electric field gradient of the nematic solvent has been minimized, the orientational order is best described by models for the short-range anisotropic potential. The most successful potentials are written in terms of anisotropic interactions between the solute surface and the liquid-crystal mean field. This represents a strong test of such models because they simultaneously fit the five independent orientational parameters obtained from the same solute, thus removing the problems associated with comparing results among different solutes in either the same or a different sample tube.}, keywords = {ALKYL CHAINS, ANISOTROPIC, FIELD, INTERMOLECULAR FORCES, liquid crystals, MAGNETIC-RESONANCE, MIXTURES, MOLECULES, NEMATIC SOLVENT, NMR, order parameters, PHASES, SHAPE, SOLUTES}, isbn = {0008-4042}, url = {://A1997XX04300014}, author = {Rendell, J. C. T. and Zimmerman, D. S. and vanderEst, A. J. and Burnell, E. E.} } @article {4149, title = {Pure rotational spectra of the van der Waals Complexes Ne-CO, Kr-CO and Xe-CO}, journal = {Journal of Chemical Physics}, volume = {106}, number = {18}, year = {1997}, note = {ISI Document Delivery No.: WX289Times Cited: 34Cited Reference Count: 56}, month = {May}, pages = {7519-7530}, type = {Article}, abstract = {The pure rotational spectra of the van der Waals dimers of Ne, Kr, and Xe with CO have been measured using a pulsed jet, cavity microwave Fourier transform spectrometer. All transitions measured were a-type R-branches, obeying selection rules Delta J=+1, Delta K-a=0, and Delta K-c=+1. Spectra with K-a=0 were measured for 7 isotopomers of Ne-CO, 13 of Kr-CO, and 17 of Xe-CO. Transitions with K-a=1 were measured for Ne-20-(CO)-C-12-O-16 and Kr-84-(CO)-C-12-O-16. Rotational constants and centrifugal distortion constants have been determined for all species, as well as the O-17 quadrupole coupling constants chi(aa) for Kr-84-(CO)-C-13-O-17 and Ne-20-(CO)-C-13-O-17. Effective structural parameters have been calculated from the rotational constants. Results derived from the O-17 quadrupole coupling constants and centrifugal distortion constants indicate that Ne-CO is considerably more flexible than Ar-CO, Kr-CO, or Xe-CO. Failure to observe hyperfine structure due to the Ne-21, Kr-83, and Xe-131 nuclei is discussed in terms of the weak rare gas-CO bonding. Comparisons have been made to the isoelectronic rare gas-N-2 van der Waals complexes. (C) 1997 American Institute of Physics.}, keywords = {ABSORPTION-SPECTROSCOPY, AR-CO, CARBON-MONOXIDE, INFRARED-SPECTRUM, INTERMOLECULAR FORCES, MICROWAVE-SPECTRUM, MOLECULAR-BEAM, POTENTIAL-ENERGY SURFACE, PULSED, VANDERWAALS COMPLEX, WEAKLY-BOUND COMPLEXES}, isbn = {0021-9606}, url = {://A1997WX28900006}, author = {Walker, K. A. and Ogata, T. and Jager, W. and Gerry, M. C. L. and Ozier, I.} } @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.} }