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Photoionization of hydrogen atom by coherent intense high-frequency short laser pulses: Direct propagation of electron wave packets on enormous spatial grids | | Philipp V. Demekhin
; David Hochstuhl
; Lorenz S. Cederbaum
; | | Date: |
15 Apr 2013 | | Abstract: | The time-dependent Schr"{o}dinger equation for the hydrogen atom and its
interaction with coherent intense high-frequency short laser pulses is solved
numerically exactly by employing the code implemented for the
multi-configurational time-dependent Hartree-Fock (MCTDHF) method. Thereby, the
wavefunction is followed in space and time for times longer than the pulse
duration. Results are explicitly shown for 3 and 10 fs pulses. Particular
attention is paid to identifying the effect of dynamic interference of
photoelectrons emitted with the same kinetic energy at different times during
the rising and falling sides of the pulse predicted in [emph{Ph.V. Demekhin
and L.S. Cederbaum}, Phys. Rev. Lett. extbf{108}, 253001 (2012)]. In order to
be able to see the dynamic interference pattern in the computed electron
spectra, the photoelectron wave packet has to be propagated over long
distances. Clearly, complex absorption potentials often employed to compute
spectra of emitted particles cannot be used to detect dynamic interference. For
the considered high-frequency pulses of 3 and 10 fs durations, this requires
enormously large spatial grids. The presently computed photoionization and
above-threshold ionization spectra are found to exhibit pronounced dynamic
interference patterns. Where available, the pattern is in a very good agreement
with previously published results. | | Source: | arXiv, 1304.4133 | | Services: | Forum | Review | PDF | Favorites | |
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