ELECTRONIC SHELLS AND SHELLS OF ATOMS IN METALLIC CLUSTERS
ELECTRONIC SHELLS AND SHELLS OF ATOMS IN METALLIC CLUSTERS
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DOI：
10.1007/bf01448248
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发表时间：
1991-01-01
期刊：
影响因子：
--
通讯作者：
LANGE, T
中科院分区：
文献类型：
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作者：
MARTIN, TP;BERGMANN, T;LANGE, T
强度异常（幻数）已被观察到的钠原子团簇包含多达22 000的质谱。 对于小的团簇（Na（n），n小于或等于1500），异常似乎是由于电子壳层（具有相同能量的子壳层组）的填充。 壳层可以用一个伪量子数来表征，这表明可能存在比球形更高的对称性。 较大团簇（1500小于或等于n小于或等于22000）的质谱很好地解释了原子二十面体或立方八面体壳的完整性。 这两种壳层（电子和原子）以不同且不重叠的尺寸间隔出现的事实可能表明，在从小到大的团簇中存在“液体”到“固体”的转变。
Intensity anomalies (magic numbers) have been observed in the mass spectra of sodium clusters containing up to 22 000 atoms. For small clusters (Na(n), n less-than-or-equal-to 1500) the anomalies appear to be due to the filling of electronic shells (groups of subshells having the same energy). The shells can be characterized rather well by a pseudoquantum-number, indicating the possible existence of a symmetry higher than spherical. The mass spectra of larger clusters (1500 less-than-or-equal-to n less-than-or-equal-to 22 000) are well explained by the completion of icosahedral or cuboctahedral shells of atoms. The fact that the two types of shells (electron and atom) occur in distinct and non-overlapping size intervals might indicate the existence of a "liquid" to "solid" transition in going from small to large clusters.