Nonadiabatic tunneling in circularly polarized laser fields. II. Derivation of formulas
Nonadiabatic tunneling in circularly polarized laser fields. II. Derivation of formulas
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DOI：
10.1103/physreva.87.013433
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发表时间：
2013-01-31
影响因子：
2.9
通讯作者：
Smirnova, Olga
中科院分区：
文献类型：
--
作者：
Barth, Ingo;Smirnova, Olga
我们提供了圆极化场对简并价 p 轨道的强场电离的详细分析。我们的分析方法在概念上等同于 Perelomov、Popov 和 Terent'ev (PPT) 理论，并且对于短程势实际上是精确的。在将我们的结果与 s 轨道的 PPT 理论进行基准比较后，我们获得了 p 轨道的结果。我们还表明，只要偶极子近似有效，PPT 方法和我们的结果都是规范不变的，这与广泛使用的强场近似 (SFA) 不同。我们的主要结果已在[I. Barth 和 O. Smirnova，物理学家。 Rev. A 84, 063415 (2011)]，强场电离优先去除与圆偏振激光场反向旋转的电子。以Kr原子为例说明了结果。强场电离对初始状态下电子旋转的敏感度高达一个数量级，是强场电离非绝热状态的关键特征之一。 DOI：10.1103/PhysRevA.87.013433
We provide detailed analysis of strong field ionization of degenerate valence p orbitals by circularly polarized fields. Our analytical approach is conceptually equivalent to the Perelomov, Popov, and Terent'ev (PPT) theory and is virtually exact for short-range potentials. After benchmarking our results against the PPT theory for s orbitals, we obtain the results for p orbitals. We also show that, as long as the dipole approximation is valid, both the PPT method and our results are gauge invariant, in contrast with widely used strong field approximation (SFA). Our main result, which has already been briefly outlined in [I. Barth and O. Smirnova, Phys. Rev. A 84, 063415 (2011)], is that strong field ionization preferentially removes electrons counter-rotating to the circularly polarized laser field. The result is illustrated using the example of Kr atom. Strong, up to one order of magnitude, sensitivity of strong field ionization to the sense of electron rotation in the initial state is one of the key signatures of nonadiabatic regime of strong field ionization. DOI: 10.1103/PhysRevA.87.013433