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 andτ 0=0.68×10−13 sec. At 98°KD r (=0.06×1013 sec−1) is down by a factor of more than three butτ 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.