Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly-excited state of He

Abstract

The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the $2s2p{}^{1}P$ doubly-excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purpose, we solve numerically the corresponding time-dependent Schrödinger equation by applying the time-dependent restricted-active-space configuration-interaction method (TD-RASCI). The present numerical results clearly demonstrate that the Fano-interferences can be controlled by a single high-frequency pulse. As long as the pulse duration is comparable to the autoionization lifetime, varying the peak intensity of the pulse enables manipulation of the underlying Fano-interference. In particular, the asymmetric profile observed for the $2s2p{}^{1}P$ doubly-excited state of He in the weak-field ionization can be smoothly transformed to a window-type interference profile.

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References in corpus (6)

• A Density Matrix-based Algorithm for Solving Eigenvalue Problems
• Femtosecond induced transparency and absorption in the extreme ultraviolet by coherent coupling of the He 2s2p (1P0) and 2p2 (1Se) double excitation states with 800 nm light
• Strong interference effects in the resonant Auger decay of atoms induced by intense X-Ray fields
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Cited by in corpus (3)

• Quantum electrodynamics of intense laser-matter interactions: A tool for quantum state engineering
• Photoelectron circular dichroism in the multiphoton ionization by short laser pulses: III. Photoionization of fenchone in different regimes
• Effects of electronic correlation on the high harmonic generation in helium: a time-dependent configuration interaction singles vs time-dependent full configuration interaction study