金属团簇的光电离分布和Fowler公式
Photoionization profiles of metal clusters and the Fowler formula
摘要：
金属团簇电离势是这些“人造原子”的重要特征，但从团簇光吸收光谱中提取这些量，特别是在存在热拖尾的情况下，仍然是一个很大的挑战。在这里，我们证明了经典的表面光电发射的Fowler理论在拟合中性In_{n=3-34}团簇的光吸收轮廓形状方面做得很好[Wucher等人，10，103007（2008）]。推导出的电离势外推精确的散装功函数，和内部集群温度与自由蒸发集群合奏预期值密切一致。补充较早的应用程序，钾簇，这些结果表明，福勒形式主义，这是直接和物理，可能是金属簇光谱的重要实用程序。也希望这些结果将鼓励全面的理论分析的适用性的批量衍生模型集群光电离行为，从原子和分子型的过渡到表面型的光电发射。
英文摘要：
Metal cluster ionization potentials are important characteristics of these "artificial atoms," but extracting these quantities from cluster photoabsorption spectra, especially in the presence of thermal smearing, remains a big challenge. Here we demonstrate that the classic Fowler theory of surface photoemission does an excellent job of fitting the photoabsorption profile shapes of neutral In_{n=3-34} clusters [Wucher et al., New J. Phys. 10, 103007 (2008)]. The deduced ionization potentials extrapolate precisely to the bulk work function, and the internal cluster temperatures are in close agreement with values expected for an ensemble of freely evaporating clusters. Supplementing an earlier application to potassium clusters, these results suggest that the Fowler formalism, which is straightforward and physical, may be of significant utility in metal cluster spectroscopy. It is hoped also that the results will encourage a comprehensive theoretical analysis of the applicability of bulk-derived models to cluster photoionization behavior, and of the transition from atomic and molecular-type to surface-type photoemission.
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