Angular distribution in two-photon double ionization of helium by intense attosecond soft-x-ray pulses
Journal Article
·
· Physical Review. A
- 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, Vol. 73, Issue 2; Other Information: DOI: 10.1103/PhysRevA.73.023402; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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