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Zhu, Jinzhen and Scrinzi, Armin (2020): Electron double-emission spectra for helium atoms in intense 400-nm laser pulses. In: Physical Review A, Vol. 101, No. 6, 063407

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Double photoelectron emission from He atoms by intense laser pulses with a wavelength of 394.5 nm is computed for intensities of 3.5-9.2 x 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 He2+/He+ ratios, and a modulation of joint energy spectra agree well with a recent experiment [K. Henrichs et al., Phys. Rev. A 98, 043405 (2018)] if one admits an increase in experimental intensities by a factor of similar to 2. We find that Freeman resonances enhance back-to-back 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 recollisions.

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