Solidification of small para-H2 clusters at zero temperature

Details Solidification of small para-H2 clusters at zero temperature Solidification of small para-H2 clusters at zero temperature

2011-03-04

arxiv.org/abs/1103.0946v1

Physics

Condensed Matter

Other Condensed Matter

17 pages, accepted for publication in J. Phys. Chem. A

Scientific paper

We have determined the ground-state energies of para-H$_2$ clusters at zero temperature using the diffusion Monte Carlo method. The liquid or solid character of each cluster is investigated by restricting the phase through the use of proper importance sampling. Our results show inhomogeneous crystallization of clusters, with alternating behavior between liquid and solid phases up to N=55. From there on, all clusters are solid. The ground-state energies in the range N=13--75 are established and the stable phase of each cluster is determined. In spite of the small differences observed between the energy of liquid and solid clusters, the corresponding density profiles are significantly different, feature that can help to solve ambiguities in the determination of the specific phase of H$_2$ clusters.

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