带电小粒子成核标度律的实验确定
Experimental Determination of Nucleation Scaling Law for Small Charged Particles
摘要：
我们在分子水平上研究了成核过程。首次实现了单个原子在宽质量范围内可控地粘附到质量选择的团簇上。我们测量了钠离子团簇Na_{n} ^{+}在n=25-200范围内的单分子成核截面。广泛使用的硬球近似显然失败的小尺寸：不仅应该汽液成核理论进行修改，而且，通过微观可逆性原理，集群衰减率统计模型。
英文摘要：
We investigated the nucleation process at the molecular level. Controlled sticking of individual atoms onto mass selected clusters over a wide mass range has been carried out for the first time. We measured the absolute unimolecular nucleation cross sections of cationic sodium clusters Na_{n}^{+} in the range n=25-200 at several collision energies. The widely used hard sphere approximation clearly fails for small sizes: not only should vapor-to-liquid nucleation theories be modified, but also, through the microreversibility principle, cluster decay rate statistical models.
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