The silane isotopomers ²⁹SiH₄ and ³⁰SiH₄ constants of the ν₂/ν₄ dyad

Abstract

The IR spectrum of two silane isotopomers containing 29 Si and 30 Si was investigated with CO 2 laser side bands in the range between 877 and 954 cm −1 at a resolution of 2 × 10 −5 cm −1 . An analysis of the ν 2 and (or) ν 4 dyad has been performed, including data obtained by Henry and Valentin from a Fourier transform spectrum and sub-Doppler lines observed by Bordé (Rev. Cethedec-Ondes NS, 83(1), 1 (1983)) and Skrzypczak et al. (J. Mol. Spectrosc. 138, 311 (1989)). From the fit 41 vibration–rotation constants, t Ω(K,nΓ) of the ν 2 /ν 4 Hamiltonian have been determined.