小团簇中阿秒时间尺度上的非平衡等离子体动力学追踪
Tracing non-equilibrium plasma dynamics on the attosecond timescale in small clusters
摘要：
研究表明，利用延时的极紫外（XUV）阿秒探测脉冲，通过测量探测脉冲分离出的电子的动能，可以追踪稀有气体团簇对真空紫外（VUV）脉冲的能量吸收.通过这个方案，我们证明，泵浦脉冲短至一个飞秒，在集群内的电子纳米等离子体的形成过程中进行的集群的充电。使用中等谐波的VUV和高谐波的XUV脉冲从同一近红外激光源，该计划与泵浦和探测脉冲之间的明确的时间延迟应该是实验上可实现的。甚至更短的脉冲持续时间，我们预测，约250阿秒的泵浦和探测脉冲可以诱导和监测纳米等离子体的非平衡动力学。
英文摘要：
It is shown that the energy absorption of a rare-gas cluster from a vacuum-ultraviolet (VUV) pulse can be traced with time-delayed extreme-ultraviolet (XUV) attosecond probe pulses by measuring the kinetic energy of the electrons detached by the probe pulse. By means of this scheme we demonstrate, that for pump pulses as short as one femtosecond, the charging of the cluster proceeds during the formation of an electronic nano-plasma inside the cluster. Using moderate harmonics for the VUV and high harmonics for the XUV pulse from the same near-infrared laser source, this scheme with well defined time delays between pump and probe pulses should be experimentally realizable. Going to even shorter pulse durations we predict that pump and probe pulses of about 250 attoseconds can induce and monitor non-equilibrium dynamics of the nano-plasma.
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