Harmonic Suppression Induced by Three-Electron Dynamics of Li in Strong Laser Fields.
Phys Rev Lett
; 131(18): 183201, 2023 Nov 03.
Article
em En
| MEDLINE
| ID: mdl-37977615
ABSTRACT
We build a model to elucidate the high harmonic generation in combined EUV and midinfrared laser fields by embodying the spin-resolved three-electron dynamics. The EUV pulse ionizes an inner-shell electron, and the midinfrared laser drives the photoelectron and steers the electron-ion rescattering. Depending on the spin of the photoelectron, the residual ion including two bound electrons can be either in a single spin configuration or in a coherent superposition of different spin configurations. In the latter case, the two electrons in the ion swap their orbits, leading to a deep valley in the harmonic spectrum. The model results agree with the time-dependent Schrödinger equation simulations including three active electrons. The intriguing picture explored in this work is fundamentally distinguished from all reported scenarios relied on spin-orbit coupling, but originates from the exchanges asymmetry of two-electron wave functions.
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MEDLINE
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Ano de publicação:
2023
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Article