连续电子波包干涉的动量映射
Momentum mapping of continuum electron wave packet interference
摘要：
分析了中红外激光脉冲电离Ar原子的二维光电子动量分布，主要集中在2Up以下的能量范围。通过广义量子轨道蒙特卡罗（GQTMC）模拟，并与含时薛定谔方程（TDSE）的数值解进行比较，我们发现在深隧穿区，再散射电子轨道的作用不明显，环内和环间的相互作用导致了环形干涉图样.在低纵向动量区，环形干涉图样将掩盖全息干涉结构。当非绝热隧穿对电离有显著贡献时，即，当Keldysh参数为1时，再散射电子轨迹的贡献变大，从而可以清楚地观察到全息干涉图样。我们的研究结果有助于获得物理洞察超快电子动力学过程的阿秒时间分辨率。
英文摘要：
We analyze the two-dimensional photoelectrons momentum distribution of Ar atom ionized by midinfrared laser pulses and mainly concentrate on the energy range below 2Up. By using a generalized quantum trajectory Monte Carlo (GQTMC) simulation and comparing with the numerical solution of time-dependent Schrodinger equation (TDSE), we show that in the deep tunneling regime, the rescattered electron trajectories plays unimportant role and the interplay between the intracycle and inter-cycle results in a ring-like interference pattern. The ring-like interference pattern will mask the holographic interference structure in the low longitudinal momentum region. When the nonadiabatic tunneling contributes significantly to ionization, i.e., the Keldysh parameter 1, the contribution of the rescattered electron trajectories become large, thus holographic interference pattern can be clearly observed. Our results help paving the way for gaining physical insight into ultrafast electron dynamic process with attosecond temporal resolution.
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