Angular distribution in two-photon double ionization of helium by intense attosecond soft-x-ray pulses

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.023402· OSTI ID:20974597

Barna, Imre F ^[1]; Jianyi, Wang ^[1]; Burgdoerfer, Joachim ^[1]

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1. Institute for Theoretical Physics, Vienna University of Technology, A1040 Vienna (Austria)

We investigate two-photon double ionization of helium by intense ({approx_equal}10{sup 15} W/cm{sup 2}) ultrashort ({approx_equal}300 as) soft-x-ray pulses (E=91.6 eV). The time-dependent two-electron Schroedinger 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 insight 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.

• OSTI ID: 20974597
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOMS
COUPLED CHANNEL THEORY
ELECTRON CORRELATION
ELECTRONS
EV RANGE 10-100
HELIUM
MULTI-PHOTON PROCESSES
PHOTOEMISSION
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
SCHROEDINGER EQUATION
SOFT X RADIATION
TIME DEPENDENCE