| Résumé | Infrared spectra of SiH4-Ar, SiH4-Kr, and SiH4-para-H2 van der Waals molecules are observed in the region of the [nu]4 fundamental band of silane by means of long-path (84-180?m), low temperature (95?K) equilibrium gas cell FTIR spectroscopy. The observed spectral features mostly correspond to unresolved Q-branches. For SiH4-Ar, some of these features are the same as those previously analyzed at high-resolution in a supersonic jet study by Randall et al. [J. Chem. Phys. 100 (1994) 7051], while others are higher K-value transitions that were not populated in the jet. The positions of these new transitions can be predicted very well by the parameters of Randall et al. For SiH4-Kr, which has not been studied previously, 15 Q-branch feature are assigned and fitted to obtain a preliminary set of parameters. For SiH4-para-H2 a single prominent feature is observed and assigned as the RQ0(J) branch with A symmetry correlating with the SiH4 monomer R(0) transition. The SiH4-Kr and SiH4-para-H2 results should be useful as a basis for future high-resolution studies of these complexes. |
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