强脉冲laser作用下稀有气体原子团簇的电子释放
Electron release of rare gas atom clusters under an intense laser pulse
摘要：
计算原子团簇的能量吸收作为激光脉冲长度$T$的函数，我们发现临界$T^*$的最大值。我们表明，$T^*$可以链接到一个最佳的集群半径$R^*$。这个半径的存在可以归因于最初在双原子分子中发现的增强电离机制。我们的研究结果表明，增强电离应该是广泛的一类稀有气体团簇。从一个简单的库仑爆炸模型出发，导出了最大能量释放与适当比例的膨胀时间之间的解析关系式，该关系式可用脉冲长度$T^*$表示。
英文摘要：
Calculating the energy absorption of atomic clusters as a function of the laser pulse length $T$ we find a maximum for a critical $T^*$. We show that $T^*$ can be linked to an optimal cluster radius $R^*$. The existence of this radius can be attributed to the enhanced ionization mechanism originally discovered for diatomic molecules. Our findings indicate that enhanced ionization should be operative for a wide class of rare gas clusters. From a simple Coulomb explosion ansatz, we derive an analytical expression relating the maximum energy release to a suitably scaled expansion time which can be expressed with the pulse length $T^*$.
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