一维简单模型原子短脉冲电离的精确理论和数值结果
Exact theory and numeric results for short pulse ionization of simple model atom in one dimension
摘要：
本文将一维模型原子连续谐波扰动的精确理论推广到两种情况：（1）原子暴露于外部谐波电场的短脉冲中;（2）强迫是由不同形状的短脉冲改变束缚势的强度所表示的。这一工作不仅是由于激光脉冲在原子电离中的广泛应用，而且也是由于我们以前对同一模型的研究，该模型成功地描述了所有阶的电离动力学，即多光子过程，尽管是用非相对论性的薛定谔方程处理的。特别是，它表明，束缚原子不能生存的激发所造成的任何非零频率和振幅的连续谐波强迫其潜力。我们目前的分析发现了短脉冲原子电离的重要规律，特别是电离这个模型系统的效率，可能也是真实的。
英文摘要：
Our exact theory for continuous harmonic perturbation of a one dimensional model atom by parametric variations of its potential is generalized for the cases when a) the atom is exposed to short pulses of an external harmonic electric field and b) the forcing is represented by short bursts of different shape changing the strength of the binding potential. This work is motivated not only by the wide use of laser pulses for atomic ionization, but also by our earlier study of the same model which successfully described the ionization dynamics in all orders, i.e. the multi-photon processes, though being treated by the non-relativistic Schrödinger equation. In particular, it was shown that the bound atom cannot survive the excitation of its potential caused by any non-zero frequency and amplitude of the continuous harmonic forcing. Our present analysis found important laws of the atomic ionization by short pulses, in particular the efficiency of ionizing this model system and presumably real ones as well.
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