Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses

Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses
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将电子电离方向映射到 VUV 和 IR 激光脉冲之间的相位延迟

DOI:
10.1103/physreva.106.043106
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发表时间:
2022
期刊:
影响因子:
2.9
通讯作者:
Mountney M
Mountney M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mountney M

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我们从理论上证明了电子电离的方向和线性偏振真空紫外(VUV)和圆红外(IR)激光脉冲之间的相位延迟之间的一对一映射。为了实现这一点,我们使用超短VUV脉冲,该脉冲定义了在IR脉冲中释放阈值以上电子时的时间和空间时刻。然后,电子可以被加速到高速,在完全由两个脉冲之间的相位延迟确定的方向上逃逸。偶极矩阵元素过渡从一个初始的束缚态的分子,考虑在这项工作中,连续得到使用量子力学技术,涉及计算精确的连续分子状态。在IR脉冲中释放电子之后,我们发展经典轨迹,忽略库仑势并考虑量子干涉,以计算最终电子动量的方向和大小的分布。我们理论上开发的概念可以实现,以产生纳米级的环电流,产生大磁场。
We theoretically demonstrate a one-to-one mapping between the direction of electron ionization and the phase delay between a linearly polarized vacuum ultraviolet (VUV) and a circular infrared (IR) laser pulse. To achieve this, we use an ultrashort VUV pulse that defines the moment in time and space when an above-threshold electron is released in the IR pulse. The electron can then be accelerated to high velocities escaping in a direction completely determined by the phase delay between the two pulses. The dipole matrix element to transition from an initial bound state of themolecule, considered in this work, to the continuum is obtained using quantum-mechanical techniques that involve computing accurate continuum molecular states. Following release of the electron in the IR pulse, we evolve classical trajectories, neglecting the Coulomb potential and accounting for quantum interference, to compute the distribution of the direction and magnitude of the final electron momentum. The concept we theoretically develop can be implemented to produce nanoscale ring currents that generate large magnetic fields.
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