Department of Physics Papers

Document Type

Journal Article

Date of this Version

8-15-1970

Publication Source

Physical Review B

Volume

2

Issue

4

Start Page

1176

Last Page

1192

DOI

10.1103/PhysRevB.2.1176

Abstract

The libron wave spectrum at zero wave vector for solid hydrogen in the Pa3 and Cmmm structures is calculated at zero temperature. Interactions other than the electrostatic interactions between molecular quadrupole moments are treated perturbatively. Comparison of our numerical and analytic results for libron frequencies and Raman intensities with the observed Raman spectrum gives strong evidence for the Pa3 structure. The scaling relation between the frequencies of the classical and quantum-librational systems is found to hold for the Pa3 but not for the Cmmm structure. The effects of zero-point librations and libron-libron interactions are studied to lowest order in 1/z, where z is the number of nearest neighbors. Although the static effects are quite small, the shifts in the libron frequencies due to these interactions are of order 15%.

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Date Posted: 12 August 2015

This document has been peer reviewed.