XUV laser脉冲中的小稀有气体团簇
Small rare gas clusters in XUV laser pulses
摘要：
采用半经典分子动力学模拟方法模拟了100 nm短脉冲激光作用下稀有气体小团簇的动力学行为。为了比较，团簇响应800 nm的激光脉冲进行了研究。对团簇内多电子原子的内电离动力学进行了详细的讨论。模拟结果证实了在XUV波长下碰撞在能量吸收中起着重要作用。在团簇内产生了令人惊讶的高电荷态的氘原子，正如在德国汉堡DESY的自由电子激光实验中观察到的那样[Wabnitz等人，Nature 420，482（2002）]，是由于带电团簇内原子的电离势降低、电离点火机制和碰撞。
英文摘要：
Semi-classical molecular dynamics simulations of small rare gas clusters in short laser pulses of 100 nm wavelength were performed. For comparison, the cluster response to 800 nm laser pulses was investigated as well. The inner ionization dynamics of the multi-electron atoms inside the cluster was treated explicitly. The simulation results underpin that at XUV wavelengths collisions play an important role in the energy absorption. The generation of the surprisingly high charge states of Xe atoms inside clusters, as they were observed in the free-electron laser experiment at DESY, Hamburg, Germany [Wabnitz et al., Nature 420, 482 (2002)], is due to the reduced ionization potential of atoms inside charged clusters, the ionization ignition mechanism, and collisions.
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