DIELECTRIC-PROPERTIES OF A LINEAR RIGID ROTOR IN 3D - THE CASE OF LARGE COLLISIONS

Exact analytical expressions for the dielectric and, for the first tim e, for the Kerr functions are explicitly calculated in both relaxation and steady-state regimes, by solving the generalized Liouville equati on (in the presence of large collisions) for the rotational motion of a linear rigid rotor in 3D. The response functions thus obtained gener alize and extend all the results recently published on the topic. The Debye-Smoluchowski or Rocard diffusion models are recovered. In partic ular, the dielectric response is in full agreement with the analysis o f Sack (1957 Proc. Phys. Sec. B 70 402, 414). Nevertheless, we draw th e reader's attention to the misprint in the susceptibility formula giv en by Sack in his equation (2.35).