On the theory of the refractive index of non-polar gases: I. Quantum mechanical part

✍ Scribed by P. Mazur; M. Mandel

• Publisher: Elsevier Science
• Year: 1956
• Weight: 424 KB
• Volume: 22
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(56)80040-2

✦ Synopsis

A quantum mechanical calculation is given for the effect of molecular interactions on the polarizability of spherical non polar molecules in a periodic external electric field. The polarizability tensor is obtained from perturbation theory as a power series in the interaction tensor Tik = Vi vk(l/rik), where rik is the distance between two molecules i and k. It is found chat the constants C x and C 2, introduced by J a n s e n and M a z u r in the static case, and characterizing the influence of molecular interactions on the polarizability, in order T -°, become now frequency dependent. This frequency dependence is explicitly evaluated for helium at frequencies of the incident wave small compared to the frequencies of the softest absorption line.