Looking inside the tunnelling barrier III: spin polarisation in strong field ionisation from orbitals with high angular momentum

Looking inside the tunnelling barrier III: spin polarisation in strong field ionisation from orbitals with high angular momentum
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观察隧道势垒 III 内部:高角动量轨道强场电离中的自旋极化

DOI:
10.1088/1361-6455/aad133
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发表时间:
2018
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
O. Smirnova
O. Smirnova
中科院分区:
--
文献类型:
--
作者:
J. Kaushal;O. Smirnova

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强场电离被称为电子通过激光场和核心势垒形成的光隧穿。时变解析r矩阵利用了强激光场中电子动力学的半经典性质,在时间传播中自然地包含了复值轨迹。轨迹的语言可以直接“运动学”解释几个新现象,如光电离中传统倾向规则的“反转”(Barth和Smirnova 2011年物理学)。Rev. A 84 063415)和自旋极化电子的产生(Barth and Smirnova 2013 Phys。Rev. A 88 013401)在强激光场电离期间。这两种现象都是由于电子在势垒下运动的运动学,并且是在短时势下预测的,即忽略了电子-核相互作用。然而,电子-核相互作用可以而且确实影响了隧穿的运动学,定义了电离倾向规则(合著论文I)和自旋极化。后者是本文研究的重点。我们考虑具有任意角动量的轨道,并将结果扩展到带正电的离子。
Strong field ionisation is known as optical tunnelling of an electron through the barrier created by the laser field and core potential. Time-dependent analytical R-matrix takes advantage of the semiclassical nature of electron dynamics in strong laser fields and naturally incorporates complex-valued trajectories in time propagation. The language of trajectories enables straightforward'kinematic'interpretation of several new phenomena such as' inversion'of the conventional propensity rules in photo-ionisation (Barth and Smirnova 2011 Phys. Rev. A 84 063415) and generation of spin-polarised electrons (Barth and Smirnova 2013 Phys. Rev. A 88 013401) during ionisation in strong laser fields. Both phenomena are due to the kinematics of the electron motion under the barrier and were predicted for short-range potentials, ie neglecting the electron–core interaction. However, the electron–core interaction can and does affect the kinematics of tunnelling defining the ionisation propensity rules (companion paper I) and spin-polarisation. The latter is the focus of this paper. We consider orbitals with arbitrary angular momentum and extend our results to positively charged ions.
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