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Dynamic interference in the resonance-enhanced multiphoton ionization of hydrogen atoms by short and intense laser pulses
Chemical Physics ( IF 2.3 ) Pub Date : 2017-10-21 , DOI: 10.1016/j.chemphys.2017.10.004
Anne D. Müller , Eric Kutscher , Anton N. Artemyev , Lorenz S. Cederbaum , Philipp V. Demekhin

Photoionization of the hydrogen atom by intense and short coherent laser pulses is investigated from first principles by a numerical solution of the time-dependent Schrödinger equation in the dipole-velocity gauge. The considered photon energies are resonant to the 1s2p excitation, and the pulse intensities are high enough to induce Rabi floppings. The computed resonance-enhanced two-photon ionization spectra as well as the three-photon above threshold ionization spectra exhibit pronounced multiple-peak patterns due to dynamic interference. Fingerprints of dynamic interference can also be seen directly in the radial density of the photoelectron. The impact of the variation of the pulse intensity and photon energy on the dynamic interference is investigated, and the angular distribution of the emitted electrons is analyzed in some details. The present precise numerical results confirm our previous theoretical predictions on the two-photon ionization spectra (Demekhin and Cederbaum, 2012) made within a minimal few-level model.



中文翻译:

短而强的激光脉冲对氢原子共振增强的多光子电离的动态干扰

通过第一时间原理,通过偶极速度计中随时间变化的薛定er方程的数值解,研究了强和短相干激光脉冲对氢原子的光电离作用。所考虑的光子能量会谐振到1个s2个p激发,并且脉冲强度足够高以引起Rabi扑灭。由于动态干扰,计算得到的共振增强的两光子电离光谱以及高于阈值的三光子电离光谱显示出明显的多峰图案。动态干扰的指纹也可以直接在光电子的径向密度中看到。研究了脉冲强度和光子能量的变化对动态干扰的影响,并详细分析了发射电子的角度分布。目前的精确数值结果证实了我们先前在最小水平模型中对双光子电离光谱的理论预测(Demekhin和Cederbaum,2012)。

更新日期:2018-02-02
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