双电子动力学和关联对He原子高次谐波产生的影响
Impact of two-electron dynamics and correlations on high-order harmonic generation in He
摘要：
在单激活电子近似下，研究了氦原子与800 nm短脉冲强激光的相互作用。为此，在偶极速度规中，采用含时的受限活性空间组态相互作用方法（TD-RASCI）求解了线偏振红外脉冲驱动下双电子波包的含时薛定谔方程.通过系统地扩展激活组态的空间，我们研究了集体双电子动力学在强场电离和高次谐波产生（HHG）过程中的作用。我们的数值结果表明，允许在他的两个电子是动态的结果在一个相当大的扩展计算的HHG频谱。
英文摘要：
The interaction of a helium atom with intense short 800 nm laser pulse is studied theoretically beyond the single-active-electron approximation. For this purpose, the time-dependent Schrödinger equation for the two-electron wave packet driven by a linearly-polarized infrared pulse is solved by the time-dependent restricted-active-space configuration-interaction method (TD-RASCI) in the dipole velocity gauge. By systematically extending the space of active configurations, we investigate the role of the collective two-electron dynamics in the strong field ionization and high-order harmonic generation (HHG) processes. Our numerical results demonstrate that allowing both electrons in He to be dynamically active results in a considerable extension of the computed HHG spectrum.
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