Evidence for highly correlated electron dynamics in two-photon double ionization of helium
(2008) Journal of Physics B: Atomic, Molecular and Optical Physics — Vol. 41, n° 5 (2008)
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- Abstract
- Experiments using new sources of XUV pulses now tackle the difficult problem of few- photon direct double ionization of atoms. Despite its apparent simplicity, the fundamental process of two- photon direct double ionization of helium is far from being understood. Here, we use a time- dependent approach to study the process. Our results for the electron angular and energy distributions demonstrate that the dominant mechanism for double- electron escape involves a highly correlated electron motion. Angular correlations strongly favour back- to- back electron emission along the polarization axis, while dynamical screening leads to an equipartition of the electron energy for a broad range of field frequencies. These features are reflected in the recoil- ion- momentum distributions that are presently accessible to experiments.
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Citations
Foumouo, E., Antoine, P., Piraux, B., Malegat, L., Bachau, H., & Shakeshaft, R. (2008). Evidence for highly correlated electron dynamics in two-photon double ionization of helium. Journal of Physics B: Atomic, Molecular and Optical Physics, 41(5). https://doi.org/10.1088/0953-4075/41/5/051001 (Original work published 2008)