Table of Contents
Journal of Experimental Physics
Volume 2014, Article ID 127050, 6 pages
http://dx.doi.org/10.1155/2014/127050
Research Article

Effect of Molecular Rotational Degrees of Freedom on Mechanical and Thermodynamic Properties of Solid Methane at Temperatures above 50 K

1Donetsk Institute for Physics and Engineering, NAS of Ukraine, Luxemburg Street 72, Donetsk 83114, Ukraine
2Novgorod State University, Great Sankt Peterburg Street 41, Velikiy Novgorod 173003, Russia
3Ben-Gurion University of Negev, P.O. Box 653, 8410501 Beer-Sheva, Israel

Received 19 June 2014; Revised 22 August 2014; Accepted 8 September 2014; Published 7 October 2014

Academic Editor: Tatyana Sizyuk

Copyright © 2014 Antonina V. Leont’eva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper presents an analysis of extensive data set of mechanical, structural, thermophysical, and spectral properties of solid methane in the temperature interval 0.5 · TtrTtr (Ttr is the triple point temperature) under equilibrium vapor pressure. It is shown that the anomalies of the studied properties (or lack of reliable data) at temperatures 60–70 K have been observed in the body of the reviewed papers. We proposed that the observed anomalies are due to a transition between classical and quantum regimes of collective rotational degrees of freedom of methane molecules in this temperature interval.