Double photo-electron momentum spectra of Helium at infrared wavelength

Abstract

Double photo-electron momentum spectra of the Helium atom are calculated \textit{ab initio} at extreme ultra-violet and near infrared wavelengths. At short wavelengths two-photon double ionization yields, two-electron energy spectra, and triply differential cross sections agree with results from recent literature. At the near infrared wavelength of $780nm$ the experimental single-to-double ionization ratio is reproduced up to intensities of $4\times 10^{14}W/c{m}^2$, and two-electron energy spectra and joint angular distributions are presented. The time-dependent surface flux (tSurff) approach is extended to full 3+3 spatial dimensions and systematic error control is demonstrated. We analyze our differential spectra in terms of an experimentally accessible quantitative measure of correlation.

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• A general model and toolkit for the ionization of three or more electrons in strongly driven atoms using an effective Coulomb potential for the interaction between bound electrons
• Triple ionization and "frustrated" triple ionization in triatomic molecules driven by intense laser fields
• A quantum simulation of dissociative ionization of $H_2^{+}$ in full dimensionality with time dependent surface flux method
• Singularity in electron-core potential as a gateway to accurate multi-electron ionization spectra in strongly driven atoms
• Experimental Evidence for Selection Rules in Multiphoton Double Ionization of Helium
• Pulse length effects in long wavelength driven non-sequential double ionization
• Understanding tunneling ionization of atoms in laser fields with the essence of multiphoton absorption
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• Single-photon double ionization: renormalized-natural-orbital theory vs multi-configurational Hartree-Fock
• Theoretical investigation of the Freeman resonance in the dissociative ionization of $H_2+$
• Single-photon and multi-photon Fano lines for helium and neon using tRecX-haCC