AN ORDERED STRUCTURE FOR BINARY-MIXTURES OF RARE-GAS ATOMS FROM NUMERICAL-SIMULATION

Simulations of clusters formed with equal proportions of Ar and Kr ato ms suggest that under certain conditions a regular CsCl structure will be formed on cooling. Comparison with similar studies of pure Kr syst ems, both as clusters and in the bulk, strengthens the reliability of these model calculations. Whether the proposed CsCl structure can actu ally form is presented as a challenge to the experimentalists, especia lly those doing molecular beam experiments. The formation of the CsCl structure by slow annealing has been the most successful, but consider able order is apparent even when the liquid cluster undergoes a very r apid quench.