6533b821fe1ef96bd127c02f

RESEARCH PRODUCT

The hot bands of silane between 2120 and 2270cm−1

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description

Abstract The infrared spectrum of the SiH 4 molecule has been recorded between 2040 and 2320 cm −1 using the high-resolution Fourier interferometer of the Laboratoire de Photophysique Moleculaire ( Orsay , France ). The resolution was 5.4 × 10 −3  cm −1 . In this region, many lines were previously analyzed and assigned to the ν 1 / ν 3 stretching dyad of 28 SiH 4 , 29 SiH 4 , and 30 SiH 4 molecules [J. Mol. Spectrosc. 143 (1990) 35]. However, several lines in the spectrum were not assigned. The results obtained in our previous study [J. Mol. Spectrosc. 197 (1999) 307] of the infrared spectrum of 28 SiH 4 , in the bending-stretching tetrad region at 3100 cm −1 , enabled us to assign 204 of the observed transitions to hot bands (the ν 1  +  ν 2 / ν 1  +  ν 4 / ν 2  +  ν 3 / ν 3  +  ν 4 bending-stretching tetrad minus the ν 2 / ν 4 bending dyad). These transitions were used to refine the set of the Hamiltonian parameters of the bending-stretching tetrad. The analysis is performed using the tensorial formalism developed in Dijon for tetrahedral molecules and implemented in the STDS software ( http://www.u-bourgogne.fr/LPUB/shTDS.html ).