The Fundamental Absorption Bands in the Infrared Spectrum of Stibine and Deuterated Stibine

Abstract

The four fundamental bands in the infrared spectrum of stibine and the two high‐frequency bands in deutero‐stibine have been measured. These bands have been sufficiently well analyzed to permit the determination of the size and the shape of the molecule. It has been possible, moreover, to correct the band centers for anharmonicity so as to estimate with considerable accuracy the values of the normal frequencies. The constants arrived at for the molecule are as follows: the SbH distance r₀=1.71A, the H–Sb–H angle α=91° 30′, the normal frequencies for stibine ω₁=1988.9, ω₂=795.9, ω₃=1974.5, ω₄=844.7, and for deutero‐stibine the values ω₁^*=1409.4, ω₂^*=568.5, ω₃^*=1403.5, and ω₄^*=599.5 cm⁻¹ are obtained.