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Simulation of solid molecular hydrogen -a new twist to an old problem

Summary: Simulation of solid molecular hydrogen -
a new twist to an old problem
Joan Adler1
and Or Cohen2
Technion - IIT, Haifa, Israel
Weizmann Institute of Science,
Rehovot, Israel
Abstract. Solid molecular orthohydrogen exhibits orientational order at low tem-
peratures. The orthohydrogen molecules, which are quadrupoles, order in the Pa3
structure. We have simulated this ordering, and explored the behaviour under di-
lution by spherical parahydrogen molecules.
1 Introduction
Solid molecular hydrogen is a fascinating material, even though some may
consider it to be less exotic than solid atomic hydrogen. It was intensively
explored in the seventies and eighties, both in the laboratory and as theo-
retical/computational models. For some states, the hydrogen molecules be-
have like quadrupoles which preferentially orient perpendicular to each other,
leading to an orientational ordering. Hydrogen has great relevance to many


Source: Adler, Joan - Physics Department, Technion, Israel Institute of Technology


Collections: Physics