We report calculations of double ionization energy spectra and momentum distributions of laser-driven helium due to few-cycle pulses of wavelength 195 nm. The results are obtained from full-dimensional numerical integration of the two electron time-dependent Schr¨odinger equation. A momentum-space analysis of doubly ionizing wavepackets shows that the concentric-ring structure of above-threshold double ionization, together with the associated structure of peaks in the total kinetic energy spectrum, may be attributed to wavepacket interference effects, where at least two doubly-ionizing wavepackets from different recollision events populate the same spatial hemisphere.
ASJC Scopus subject areas
- Physics and Astronomy(all)
Armstrong, G., Parker, J., & Taylor, K. (2011). Double-Electron Above-Threshold Ionization Resonances as Interference Phenomena. New Journal of Physics, 13, . https://doi.org/10.1088/1367-2630/13/1/013024