Department of Physics Papers

Document Type

Journal Article

Date of this Version

3-1970

Publication Source

Physical Review A

Volume

1

Issue

3

Start Page

878

Last Page

887

DOI

10.1103/PhysRevA.1.878

Abstract

Terms up to order (Γ/kBT)5 in the high-temperature expansion of the orientational specific heat of ortho-para alloys of solid H2 or D2 are evaluated. Good agreement is obtained between theory and experiment using a Padé approximant and effective values of the quadrupolar coupling constant, Γeff0=0.83 for D2 and Γeff0=0.80 for H2, where Γ0 is the value for a rigid lattice. These values agree with other determinations of Γeff, whereas the T−2 approximation for the specific heat yields anomalously small values of Γeff.

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Date Posted: 12 August 2015

This document has been peer reviewed.