Cluster matter formation in cluster collisions

By using the tight-binding molecular dynamics simulations in cluster collisions, we give some evidences of the structures of (Na₉) ₂ cluster dimer and (Na₄)₄ cluster tetramer from the dynamical point of view. We show that the (Na₉)₂ and (Na₄)₄ cluster matter may exist as intermediate states and finally decay to compact structure in real collision process. With a technique called "sharp cooling", the stable cluster structures (Na₉)₂ and (Na₄)₄ are brought into being to end. The eigen-mode frequencies of these clusters are obtained with Fourier transform of the velocity auto-correlation function which can characterize their structure properties.