Determination of the Ionization Time Using Attosecond Photoelectron Interferometry
Determination of the Ionization Time Using Attosecond Photoelectron Interferometry
复制标题
使用阿秒光电子干涉法测定电离时间
DOI：
10.1103/physrevlett.121.253203
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发表时间：
2018
影响因子：
8.6
通讯作者：
Lu Peixiang
中科院分区：
文献类型：
--
作者：
Tan Jia;Zhou Yueming;He Mingrui;Chen Yinbo;Ke Qinghua;Liang Jintai;Zhu Xiaosong;Li Min;Lu Peixiang
激光诱导原子和分子的电子隧穿电离是阿秒强场中一类有趣现象的触发器。了解电子隧穿电离的时间对于实现阿秒计量的最终精度至关重要。我们提出了一种新的阿秒光电子干涉仪，它是基于直接和近向前再散射电子波包的干涉，以确定表征隧穿过程的时间信息。在强基场的正交方向上加一个弱微扰，改变了直接和近前向再散射电子波包的相位，导致光电子动量分布干涉图的移动。通过分析干涉图对微扰的响应，精确地反演了电离时间的真实的部分，它表示电子离开势垒的时刻，以及相关的再散射时间。此外，电离时间的虚部，这已被解释为一个有关的电子运动的势垒下的量，也明确地确定。
Laser-induced electron tunneling ionization from atoms and molecules plays as the trigger for a broad class of interesting strong-field phenomena in attosecond community. Understanding the time of electron tunneling ionization is vital to achieving the ultimate accuracy in attosecond metrology. We propose a novel attosecond photoelectron interferometer, which is based on the interference of the direct and near-forward rescattering electron wave packets, to determine the time information characterizing the tunneling process. Adding a weak perturbation in orthogonal to the strong fundamental field, the phases of the direct and the near-forward rescattering electron wave packets are modified, leading to the shift of the interferogram in the photoelectron momentum distributions. By analyzing the response of the interferogram to the perturbation, the real part of the ionization time, which denotes the instant when the electron exits the potential barrier, and the associated rescattering time are precisely retrieved. Moreover, the imaginary part of the ionization time, which has been interpreted as a quantity related to electron motion under the potential barrier, is also unambiguously determined.