标题： 均质形核的动力学 显示英文标题

标题： Dynamics of homogeneous nucleation

摘要： 经典均相成核理论被表述为在给定温度下过饱和气体中密度涨落的理论。 但分子动力学模拟显示，是小的冷团簇引发了成核。 成核团簇中的温度会发生涨落，但在达到临界成核尺寸之前，平均温度始终低于过饱和气体的温度。 然而，临界核的温度等于过饱和气体的温度。 均相成核的动力学不仅由单体的凝聚或蒸发引起的生长或收缩引起，还由每时间步团簇尺寸按指数衰减的变化引起，这种变化与过饱和气体中的团簇分布相同。 显示英文摘要

摘要： The classical nucleation theory for homogeneous nucleation is formulated as a theory for a density fluctuation in a supersaturated gas at a given temperature. But Molecular Dynamics simulations reveal that it is small cold clusters which initiates the nucleation. The temperature in the nucleating clusters fluctuate, but the mean temperature remains below the temperature in the supersaturated gas until they reach the critical nucleation size. The critical nuclei have, however, a temperature equal to the supersaturated gas. The kinetics of homogeneous nucleation is not only caused by a grow or shrink by accretion or evaporation of monomers only, but by an exponentially declining change in cluster size per time step equal to the cluster distribution in the supersaturated gas.