钠团簇的电荷诱导Fragmentation
Charge-Induced Fragmentation of Sodium Clusters
摘要：
用{ \em ab initio}分子动力学研究了裂变率X>1的高电荷钠团簇的裂变.发现Na_{24} ^{4+}在1 ps的时间尺度上主要经历连续的Na_{3} ^{+}发射，而Na_{24} ^{Q+}（5 \leq Q \leq 8）在\geq 0.1 ps的时间尺度上经历多重碎片化，随着Q的增加，Na^{+}逐渐成为主要碎片。观察到大小n=6的所有单电荷片段Na_{n} ^{+}。对于T \leq 1500 K，在统计误差范围内，所观察到的碎片谱与母团簇的温度T无关。这些发现与实验观察到的最新趋势一致，并解释了这些趋势。
英文摘要：
The fission of highly charged sodium clusters with fissilities X>1 is studied by {\em ab initio} molecular dynamics. Na_{24}^{4+} is found to undergo predominantly sequential Na_{3}^{+} emission on a time scale of 1 ps, while Na_{24}^{Q+} (5 \leq Q \leq 8) undergoes multifragmentation on a time scale \geq 0.1 ps, with Na^{+} increasingly the dominant fragment as Q increases. All singly-charged fragments Na_{n}^{+} up to size n=6 are observed. The observed fragment spectrum is, within statistical error, independent of the temperature T of the parent cluster for T \leq 1500 K. These findings are consistent with and explain recent trends observed experimentally.
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