强laser脉冲对He原子2s 2 p双激发态自电离动力学的影响
Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly-excited state of He
摘要：
从理论上研究了在$2s2p\,^1P$双激发态附近，氦原子在短脉冲强激光作用下的光电离，研究了激发脉冲强度和脉宽对自电离过程动力学的影响.为此，我们采用含时限制活性空间组态相互作用方法（TD-RASCI）数值求解了相应的含时薛定谔方程。目前的数值结果清楚地表明，Fano干扰可以控制由一个单一的高频脉冲。只要脉冲持续时间与自电离寿命相当，改变脉冲的峰值强度就能够操纵潜在的Fano干扰。特别地，在弱场电离中观察到的He的$2s2p\,^1P$双激发态的不对称轮廓可以平滑地转变为窗口型干涉轮廓。
英文摘要：
The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the $2s2p\,^1P$ doubly-excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purpose, we solve numerically the corresponding time-dependent Schrödinger equation by applying the time-dependent restricted-active-space configuration-interaction method (TD-RASCI). The present numerical results clearly demonstrate that the Fano-interferences can be controlled by a single high-frequency pulse. As long as the pulse duration is comparable to the autoionization lifetime, varying the peak intensity of the pulse enables manipulation of the underlying Fano-interference. In particular, the asymmetric profile observed for the $2s2p\,^1P$ doubly-excited state of He in the weak-field ionization can be smoothly transformed to a window-type interference profile.
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