Xie Hui, Li Min, Li Yang, Zhou Yueming, Lu Peixiang
Opt Express. 2016 Nov 28;24(24):27726-27737. doi: 10.1364/OE.24.027726.
Using semiclassical models with implementing interference effects, we study the low-energy photoelectron intra-half-cycle interferences among nonscattering trajectories and multiple forward scattering trajectories of atoms ionized by a strong mid-infrared laser field. Tracing back to the initial tunneling coordinates, we find that up to three kinds of forward scattering trajectories have substantial contributions to the low-energy photoelectrons. Those multiple forward scattering trajectories depend sensitively on the initial transverse momentum at the tunnel exit and they lead to sign reversal of the transverse momentum of the electrons. We show that the interference of the nonscattering trajectory and the triple-scattered trajectory has the largest contribution to the low-energy structure in mid-infrared laser fields. It is also shown that the long-range Coulomb potential has a significant effect on the low-energy photoelectron interference patterns.
利用包含干涉效应的半经典模型，我们研究了被强中红外激光场电离的原子的非散射轨迹与多条前向散射轨迹之间的低能光电子半周期内干涉。追溯到初始隧穿坐标，我们发现多达三种前向散射轨迹对低能光电子有显著贡献。那些多条前向散射轨迹敏感地依赖于隧穿出口处的初始横向动量，并且它们导致电子横向动量的符号反转。我们表明，非散射轨迹与三散射轨迹的干涉对中红外激光场中的低能结构贡献最大。还表明，长程库仑势对低能光电子干涉图样有显著影响。
