Adiabatic theory of strong-field ionization of molecules including nuclear motion
Adiabatic theory of strong-field ionization of molecules including nuclear motion
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DOI：
10.1103/physreva.101.053422
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发表时间：
2020-05
影响因子：
2.9
通讯作者：
J. Svensmark;O. Tolstikhin;T. Morishita
中科院分区：
文献类型：
--
作者：
J. Svensmark;O. Tolstikhin;T. Morishita
发展了考虑核间运动的分子强场电离绝热理论。两个绝热制度的电子，核，和激光场的时间尺度被认为是。在第一种状态下，场是最慢的;也就是说，它的时标比电子和核时标大得多。相应的理论通过将核间运动与电子运动同等对待来推广具有冷冻核的原子和分子的强场电离的绝热理论[Phys.Rev.A86，043417（2012）PLRAAN 1050 -294710.1103/PhysRevA.86.043417]。在第二个区域，活跃的电子是最快的;也就是说，它的时标比原子核和激光场的时标小得多。相应的理论自然涉及玻恩-奥本海默近似。绝热理论的两个版本进行了验证，通过比较他们的预测与精确的数值结果，通过求解含时薛定谔方程（TDSE）的模型双原子分子与一个电子和一个核间自由度。绝热结果收敛到TDSE结果一致相对于激光场的振幅在隧道和越垒电离制度。讨论了该理论在分析核间运动强场效应中的两个应用。
The adiabatic theory of strong-field ionization of molecules with internuclear motion included into consideration is developed. Two adiabatic regimes in terms of the electronic, nuclear, and laser field timescales are considered. In the first regime, field is the slowest; that is, its timescale is much larger than the electronic and nuclear timescales. The corresponding theory generalizes the adiabatic theory of strong-field ionization of atoms and molecules with frozen nuclei [Phys. Rev. A 86, 043417 (2012)PLRAAN1050-294710.1103/PhysRevA.86.043417] by treating the internuclear motion on equal footing with the electronic motion. In the second regime, the active electron is the fastest; that is, its timescale is much smaller than that of the nuclei and laser field. The corresponding theory naturally involves the Born-Oppenheimer approximation. The two versions of the adiabatic theory are validated by comparing their predictions with accurate numerical results obtained by solving the time-dependent Schrödinger equation (TDSE) for a model diatomic molecule with one electronic and one internuclear degree of freedom. The adiabatic results are shown to converge to the TDSE results uniformly with respect to the laser field amplitude both in tunneling and over-the-barrier ionization regimes. Two applications of the theory to the analysis of strong-field effects associated with the internuclear motion are discussed.