Dynamics of liquid silane

Abstract

Neutron scattering of cold neutrons from liquid silane at 137°K and 98°K is explained on the basis of a simple model. The rotational diffusion constant,D r, and the delay time,τ 0, after which rotational diffusion may be said to occur are derived on the basis of this model. At 137°K we getD r=0.22×10¹³ sec^-1 and τ 0=0.68× 10^-13 sec. At 98°KD r (=0.06×10¹³ sec^-1) is down by a factor of more than three butt 0=(0.54×10^-13 sec) shows only a small change. By comparison with data on liquid CH₄ it is concluded that the law of corresponding states is not applicable for describing rotational dynamics of CH₄ and SiH₄. Rotational motions in SiH₄ are more hindered than in CH4 at the same reduced temperature.