复Kohn变分法在阿秒光谱中的应用
Application of the Complex Kohn Variational Method to Attosecond Spectroscopy
摘要：
将复Kohn变分法推广到计算原子分子体系中光驱动电子在连续波函数之间的跃迁。这一发展使得在微扰制度的任意光偏振的多光子过程的研究。作为一个证明的原则，我们应用该方法计算所产生的光电子谱的泵浦探测双光子电离的氦诱导的序列的极紫外和红外光脉冲。我们比较了几个双光子电离泵浦-探测光谱，共振与（2s 2 p）1 P10费什巴赫共振，独立的模拟的基础上原子B样条紧耦合STOCK代码，并发现这两种方法之间的良好协议。这一新的有限脉冲微扰方法是对多电子分子中弱场阿秒过程进行从头计算研究的一个步骤。
英文摘要：
The complex Kohn variational method is extended to compute light-driven electronic transitions between continuum wavefunctions in atomic and molecular systems. This development enables the study of multiphoton processes in the perturbative regime for arbitrary light polarization. As a proof of principle, we apply the method to compute the photoelectron spectrum arising from the pump-probe two-photon ionization of helium induced by a sequence of extreme ultraviolet and infrared-light pulses. We compare several two-photon ionization pump-probe spectra, resonant with the (2s2p)1P1o Feshbach resonance, with independent simulations based on the atomic B-spline close- coupling STOCK code, and find good agreement between the two approaches. This new finite-pulse perturbative approach is a step towards the ab initio study of weak-field attosecond processes in poly-electronic molecules.
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