Strong field double ionization of atoms below the recollision threshold

Intensity dependence of strong-field double-ionization mechanisms: From field-assisted recollision ionization to recollision-assisted field ionization

A. Emmanouilidou and A. Staudte Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom Chemistry Department, University of Massachusetts at Amherst, Amherst, Massachusetts 01003, USA Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6 Received 29 May 2009; publishe...

Recollision dynamics and time delay in strong-field double ionization.

Three-dimensional classical ensembles are employed to study recollision dynamics in double ionization of atoms by 780-nm intense lasers. After recollision one electron typically remains bound to the atom for a portion of a laser cycle, during which time the nucleus strongly influences its direction of motion. The electron then escapes over a suppressed barrier, with its final momentum depending...

Electron Drift Directions in Strong-Field Double Ionization of Atoms

Longitudinal momentum spectra and electron drift directions are considered for several laser wavelengths in Non-Sequential Double Ionization of helium using three dimensional classical ensembles. In this model, the familiar doublet for wavelength 800 nm and intensities of order 5x1014 W cm−2, becomes a triplet for wavelength 1314 nm, then a doublet with plateau for 2017 nm. The results are expl...

Strong-field double ionization of rare gases.

We have studied the double ionization of helium and other rare gases using an electron-ion coincidence technique. With this scheme, the electron energy spectrum correlated to the creation of a doubly charged ion may be compiled. In all cases, the observed double ionization electron distributions are similar and enhanced at high energies, while the single ionization spectra exhibit distinct diff...

Recollision-Induced Double Ionization of Ar and Ne Atoms: Wavelength Dependence