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arXiv · 1912.09250

Electron double-emission spectra for Helium atoms in intense 400 nm laser pulses

Jinzhen Zhu·Armin Scrinzi
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Abstract

Double photoelectron emission from He atoms by intense laser pulses with a wave length of $394.5\,nm$ is computed for intensities $3.5 - 9.2\times 10^{14}W/cm^2$. Joint momentum distributions confirm the characteristics seen in classical trajectory calculations. The pronounced transition from back-to-back to side-by-side emission with increasing intensity, the $He^{++}/He^+$ ratios, and a modulation of joint energy spectra agree well with a recent experiment [Henrichs et al., PRA 98, 43405 (2018)], if one admits an increase of experimental intensities by a factor $\sim 2$. We find that Freeman resonances enhance anti-correlated emission, we identify the signature of electron repulsion in joint angular distributions, and we interpret the modulation of joint energy spectra as a signature of multiple recollsions.

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Jinzhen Zhu, Armin Scrinzi. 2019-12-19. Electron double-emission spectra for Helium atoms in intense 400 nm laser pulses. https://doi.org/10.1103/physreva.101.063407

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