Comparison of trapping sites of anthracene in hexagonal and cubic argon matrices: a molecular dynamics study

Geometries and energies for possible trapping sites of anthracene in hexago nal closed packed (hcp) argon matrices have been calculated and compared to corresponding trapping sites calculated for the face centered cubic fee ar gon host. The random search method (RSM) has been applied which combines st atistical and molecular dynamics (MD) components in the generation of initi al geometries and their relaxation. A total of 1322 runs yielded 12 unique site structures. In none of them the anthracene is located in the {111}-pla ne of the host crystal, in contrast to the situation found for the fee host structure.