含时量子蒙特卡罗方法研究两电子原子在强激光作用下电子的动力学行为

摘要

We investigate the electron dynamic process of a one-dimensional two-electron atom irradiated by strong laser pulse using the improved time-dependent quantum Monte Carlo （TDQMC） scheme. By comparison with the scheme for solving the time-dependent Schrodinger equation by using the accurate numerical integration, the dynamic variation of particle in a quantum ensemble, corresponding to the calculated wave-packet, is consistent with the evolution of time-dependent wavepacket. The computation efficiency of the TDQMC is more largely enhanced than that of the time-dependent integration method. According to the dynamic evolution behaviors of the calculated classical particle ensemble, we analyze the excitation, ionization, recombination of electron and other non-linear processes in a strong laser field.%通过改进含时量子蒙特卡罗方法研究了一维模型双电子原子在强激光作用下的电子动力学过程．与准确的数值积分求解含时薛定谔方程相比，计算得到的波包对应的量子系综中粒子的动力学变化和含时波包演化结果定性一致，且大幅度地提高了计算效率．根据计算得到的经典粒子系综的动力学演化行为，分析了原子在强激光作用下的激发、电离、重散射等非线性过程．