论文标题
长波长密度波动作为成核前体
Long-wavelength density fluctuations as nucleation precursors
论文作者
论文摘要
超出经典成核理论的最新成核理论预测，从低密度蒸气（或弱溶液）中，液滴和晶体的扩散限制成核始于长波长密度的波动。这意味着，在成核的早期阶段，“簇”可以具有低密度但空间范围很大，这与凝结相的任意小簇的经典图片不一致。我们使用正向通量采样介绍了动力学蒙特卡洛模拟的结果，以证明这些预测已得到证实：即平均而言，成核始于存在低振幅的情况下，但在空间扩展的密度波动上，因此证实了非古典理论的显着预测。
Recent theories of nucleation that go beyond Classical Nucleation Theory predict that diffusion-limited nucleation of both liquid droplets and of crystals from a low-density vapor (or weak solution) begins with long-wavelength density fluctuations. This means that in the early stages of nucleation, 'clusters' can have low density but large spatial extent, which is at odds with the classical picture of arbitrarily small clusters of the condensed phase. We present the results of kinetic Monte Carlo simulations using Forward Flux Sampling to show that these predictions are confirmed: namely that on average, nucleation begins in the presence of low-amplitude, but spatially extended density fluctuations thus confirming a significant prediction of the non-classical theory.
