Raman bandwidths and molecular motion in liquid HSiCℓ3 and DSiCℓ3

Abstract

The three Raman A_l-bands of trichloromonosilanes HSiCℓ₃, DSiCℓ₃ are studied in the neat liquid state and in solution (isotopic dilution and inert solvent SiCℓ₄). The depolarization ratio ϱ is measured from the integrated strengths. The relaxation times τ_v and τ_2R are deduced from the corresponding correlation functions G_v(t) and G_2R(t).

Pure dephasing relaxation is predominant for the vibrational modes; the rotational relaxation appears to be of the diffusional type in SiCℓ4 and nearly free for the neat liquids at room temperature.