Monte Carlo simulation of an argon cluster confined in zeolite $NaCaA^\hspace{3mm}1$

A Monte Carlo simulation of a thirteen-atom argon cluster in supercages of zeolite NaCaA is reported. The confined cluster undergoes distortion giving a peak in the angle distribution function at around 90°. The structure, energetics and other properties are dictated by a competition between guest-guest and guest-zeolite interactions. It is found that the duster melts in the region from 25 to 40 K. The change in \delta during melting is smaller than that observed for bulk matter or that for the free cluster, which we attribute to confinement