Polarizability of Methane Deposits
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This paper presents results of an experimental study of the influence of deposition temperature on the refractive indices of methane in the form of cryovacuum deposited thin films. The experiments were performed in the vicinity of temperature of methane phase transition \(T=20.4\) K. The results allowed to determine the polarizability of methane molecules in the solid phase. The measurements were taken using a two-beam laser interferometer in the temperature range of 14–32 K. Calculations of polarizability were performed using the Lorentz–Lorenz equation by analogy to the calculations of the polarizability of carbon dioxide carried out in Domingo’s article. The polarizability of methane demonstrates the dependence on deposition temperature, and it has small jump at the temperature of a structural phase transformation. It is speculated that the observed abrupt change in the refractive index is due to a difference in the numbers of vibrational and rotational degrees of freedom of the molecules belonging to different structural phases of the methane.
KeywordsMethane Thin films Polarizability Refractive index Density Substrate Low temperature Phase transition
This research was supported by the Ministry of Education and Science of the Republic of Kazakhstan, Program of special foundation of science research.
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