IR absorption spectra of monoisotopic 28 SiH 4 and 76 GeH 4 are studied in Ar and N 2 matrices at 10 K. It is shown that the absorption spectra of silane and germane are similar in the regions of the stretching ν 3 and bending ν 4 vibrations. Four groups of bands can be separated out in the spectra of each molecule:(1) narrow bands characteristic of the matrix isolation studies, (2) broad bands, (3) diffuse absorption with a large value of the spectral moment the intensity of which increases upon annealing, and (4) bands of dimers the intensity of which increases quadratically with concentration. The spectra of 28 SiH 4 and 76 GeH 4 in nitrogen matrices contain a triplet in the stretching region and a doublet in the bending region, which is explained by the change in the molecular symmetry from T d to C 3V on passage from the gas phase to solid nitrogen.

No abstract

No abstract

No abstract

No abstract