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ABSTRACT:
Adsorption of para-H2 films on Alkali metals substrates at low temperature
is studied theoretically by means of Path Integral Monte Carlo simulations.
Realistic potentials are utilized to model the interaction between two para-H2
molecules, as well as between a para-H2 molecule and the substrate, assumed
smooth.
Results show that adsorption of para-H2 on a Lithium substrate, the most
attractive among the Alkali, occurs through completion of successive solid
adlayers.
Each layer has a two-dimensional density ne approxinately equal to 0.070 A-2.
A solid para-H2 monolayer displays a higher degree of confinement, in the
direction perpendicular to the substrate, than a monolayer Helium film,
and has a melting temperature of about 6.5 K.
The other Alkali substrates are not attractive enough to be wetted by H2
at low temperature. No evidence of a possible superfluid phase of para-H2
is seen in these systems.
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STATISTICS
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