Physics – Atomic Physics
Scientific paper
2006-01-11
Phys. Rev. A 73, 023402 (2006)
Physics
Atomic Physics
17 pages, 6 figs
Scientific paper
10.1103/PhysRevA.73.023402
We investigate two-photon double ionization of helium by intense ($10^{15} W/cm^2$) ultrashort ($\approx 300$ as) soft X-ray pulses (E = 91.6 eV). The time-dependent two-electron Schr\"odinger equation is solved using a coupled channel method. We show that for ultrashort pulses the angular distribution of ejected electrons depends on the pulse duration and provides novel insights into the role of electron correlations in the two-electron photoemission process. The angular distribution at energies near the ``independent electron'' peaks is close to dipolar while it acquires in the ``valley'' of correlated emission a significant quadrupolar component within a few hundred attoseconds.
Barna Imre Ferenc
Burgdoerfer Joachim
Wang Jeffrey
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