The S$_0$(0) structure in highly compressed hydrogen and the orientational transition

Details The S$_0$(0) structure in highly compressed hydrogen and the orientational transition The S$_0$(0) structure in highly compressed hydrogen and the orientational transition

2004-10-13

arxiv.org/abs/cond-mat/0410331v1

Physics

Condensed Matter

Statistical Mechanics

accepted Europhysics Letters

Scientific paper

10.1209/epl/i2004-10256-8

A calculation of the rotational S$_0$(0) frequencies in high pressure solid para-hydrogen is performed. Convergence of the perturbative series at high density is demonstrated by the calculation of second and third order terms. The results of the theory are compared with the available experimental data to derive the density behaviour of structural parameters. In particular, a strong increase of the value of the lattice constant ratio $c/a$ and of the internuclear distance is determined. Also a decrease of the anisotropic intermolecular potential is observed which is attributed to charge transfer effects. The structural parameters determined at the phase transition may be used to calculate quantum properties of the rotationally ordered phase.

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