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Observation of the quantum shift of a backward rescattering caustic by carrier-envelope phase mapping
Physical Review A ( IF 2.9 ) Pub Date : 2021-04-29 , DOI: 10.1103/physreva.103.043121
Tomoya Mizuno , Nobuhisa Ishii , Teruto Kanai , Philipp Rosenberger , Dominik Zietlow , Matthias F. Kling , Oleg I. Tolstikhin , Toru Morishita , Jiro Itatani

We study carrier-envelope phase (CEP) -dependent photoelectron momentum distributions (PEMDs) generated by strong-field ionization of Xe atoms with linearly polarized sub-two-cycle near-infrared laser pulses. The PEMDs in the polarization direction end with a cutoff structure whose position and shape are analyzed using the adiabatic theory of rescattering [T. Morishita and O. I. Tolstikhin, Phys. Rev. A 96, 053416 (2017)]. This theory predicts that the cutoff, wherein the PEMD begins to exponentially decay, is located at a quantum caustic that is shifted towards higher energies with respect to the corresponding classical caustic at which long and short backward rescattering trajectories coalesce. The observed position of the cutoff in the PEMDs agrees well with the adiabatic theory, confirming the quantum shift of the caustic. This result paves the way to a more accurate procedure for extracting electron-ion elastic scattering differential cross sections from CEP-dependent cutoffs in strong-field PEMDs.

中文翻译:

通过载流子-相位包络图观察向后散射苛性碱的量子位移

我们研究了通过线性极化的亚两周期近红外激光脉冲对Xe原子的强场电离所产生的依赖于载流子包络相(CEP)的光电子动量分布(PEMD)。在偏振方向上的PEMD以截止结构结束,其截止位置和形状使用绝热重散射理论分析[T。Morishita和OI Tolstikhin,物理学。A版 96,053416(2017)]。该理论预测,其中PEMD开始呈指数衰减的截止点位于一个量子焦散中,该量子焦散相对于相应的经典焦散朝着更高的能量移动,在该经典焦散中,长短反向向后散射轨迹会聚。在PEMDs中观察到的截止位置与绝热理论非常吻合,证实了苛性碱的量子位移。这一结果为从强场PEMD中依赖CEP的临界值中提取电子离子弹性散射微分截面的更精确程序铺平了道路。
更新日期:2021-04-29
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