Dynamic heterogeneous structure relaxation of supercooled liquids

Molecular dynamics simulations have been carried out on a two-component Mor se potential system quenched into supercooled liquid states. The relaxation process and the temperature dependence of the diffusion constants were stu died. Using the probability model of relaxation and the dynamic heterogenei ties, we give an understanding of the nonexponential structure relaxation i n the supercooled liquid state. The relaxation time and its distribution wi dth were obtained. It was found that the distribution width of the relaxati on time increases with decreasing temperature, and the relaxation time show s the same temperature dependence as the diffusion constant.