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Double photoelectron emission from He atoms by intense laser pulses with awave length of $394.5\,nm$ is computed for intensities $3.5 - 9.2\times10^{14}W/cm^2$. Joint momentum distributions confirm the characteristics seenin classical trajectory calculations. The pronounced transition fromback-to-back to side-by-side emission with increasing intensity, the$He^{++}/He^+$ ratios, and a modulation of joint energy spectra agree well witha recent experiment [Henrichs et al., PRA 98, 43405 (2018)], if one admits anincrease of experimental intensities by a factor $\sim 2$. We find that Freemanresonances enhance anti-correlated emission, we identify the signature ofelectron repulsion in joint angular distributions, and we interpret themodulation of joint energy spectra as a signature of multiple recollsions.

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