Photoionization of hydrogen in a strong static electric field

Photoionization of hydrogen in a strong static electric field
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强静电场中氢的光电离

DOI：
10.1103/physreva.95.043417
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发表时间：
2017
期刊：
Phys. Rev. A
影响因子：
--
通讯作者：
and T. Morishita
and T. Morishita
中科院分区：
--
文献类型：
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作者：
S. Ohgoda;O. I. Tolstikhin;and T. Morishita

文献摘要

相似文献

我们分析了强静电场下氢的光电离。这样的场本质上改变了未受扰动原子的光谱。即使基态也获得了不可忽略的宽度，而更高的无场束缚态则变成重叠共振。与此同时，最近发现的静电场感应态（SFIS）[A. V. Gets 和 O. I. Tolstikhin，物理学。 Rev. A 87, 013419 (2013)PLRAAN1050-294710.1103/PhysRevA.87.013419]出现在无场连续体中。我们从衰变的初始状态制定了光电离理论，并定义了适当的可观测量——降低的光电离率和光电子的横向动量分布。这些可观测量是针对不同偏振情况下的四个初始状态和 2 计算的。 SFIS 在可观测值中表现为明显的峰值。值得注意的是，即使是宽的 SFIS 也可以被视为在其宽度与初始状态相当的字段中狭窄且明显的峰。 SFIS 表现的这种共振增强是本文的主要发现。这一发现表明，在目前强场物理中使用的强低频激光脉冲准静态场的情况下，SFIS 也应该在光电离产生的光电子动量分布中表现出来。
We analyze photoionization of hydrogen in the presence of a strong static electric fielda.u. Such a field essentially modifies the spectrum of the unperturbed atom. Even the groundstate acquires a non-negligible width, while the higher field-free bound states become overlapping resonances. At the same time, static-field-induced states (SFISs) found recently [A. V. Gets and O. I. Tolstikhin, Phys. Rev. A 87, 013419 (2013)PLRAAN1050-294710.1103/PhysRevA.87.013419] emerge in the field-free continuum. We formulate the theory of photoionization from a decaying initial state and define appropriate observables—the reduced photoionization rate and transverse momentum distribution of photoelectrons. These observables are calculated for the four initial states withand 2 in the different polarization cases. The SFISs are shown to manifest themselves as distinct peaks in the observables. Remarkably, even broad SFISs can be seen as narrow well-pronounced peaks at fields where their widths are comparable to that of the initial state. Such a resonance enhancement of the manifestations of SFISs is the main finding of this paper. This finding suggests that SFISs should manifest themselves also in photoelectron momentum distributions produced by photoionization in the presence of a quasistatic field of intense low-frequency laser pulses currently used in strong-field physics.