Density-Dependent Phase Transition and Anisotropic Interactions in Solid Parahydrogen and Orthodeuterium
Stephen C. DuranaDepartment of Chemistry, University of California, Los Angeles, California 90024J. P. McTagueDepartment of Chemistry, University of California, Los Angeles, California 90024
1973en
ABI
Abstract
Raman scattering studies of the $J=0\ensuremath{\rightarrow}2$ rotational transitions in solid parahydrogen and orthodeuterium over the pressure range $0<~p<~3.3$ kbar have revealed a phase transition from hcp to fcc, with the fcc structure being stable at high pressures and hcp stable at low pressures (\ensuremath{\lesssim} 0.8 kbar). In both phases the main anisotropic interaction is molecular electric quadrupole-quadrupole ($\ensuremath{\sim}{R}^{\ensuremath{-}5}$), but we observe significant effects tentatively attributed to correlated zero-point motion.
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