Energy Correlation in Above-Threshold Nonsequential Double Ionization at 800 nm

Details Energy Correlation in Above-Threshold Nonsequential Double Ionization at 800 nm Energy Correlation in Above-Threshold Nonsequential Double Ionization at 800 nm

2009-12-20

arxiv.org/abs/0912.4014v1

Physical Review A 82, 021403(R) (2010)

Physics

Optics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevA.82.021403

We have investigated the energy correlation of the two electrons from nonsequential double ionization of helium atom in 800 nm laser fields at intensities below the recollision threshold by quantum calculations. The circular arcs structure of the correlated electron momentum spectra reveals a resonant double ionization process in which the two electrons transit from doubly excited states into continuum states by simultaneously absorbing and sharing excess energy in integer units of the photon energy. Coulomb repulsion between the two electrons in continuum states is responsible for the dominant back-to-back electron emission and two intensity-independent cutoffs in the two-electron energy spectra.

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