Competition of resonant and nonresonant paths in resonance-enhanced two-photon single ionization of he by an ultrashort extreme-ultraviolet pulse

Kenichi L. Ishikawa, Kiyoshi Ueda

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47 Citations (Scopus)

Abstract

We theoretically study the pulse-width dependence of the photoelectron angular distribution (PAD) from the resonance-enhanced two-photon single ionization of He by femtosecond (20fs) extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schrödinger equation. In particular, we focus on the competition between resonant and nonresonant ionization paths, which leads to the relative phase δ between the S and D wave packets distinct from the corresponding scattering phase shift difference. When the spectrally broadened pulse is resonant with an excited level, the competition varies with pulse width, and, therefore, δ and the PAD also change with it. On the other hand, when the Rydberg manifold is excited, δ and the PAD do not much vary with the pulse width, except for the very short-pulse regime.

Original languageEnglish
Article number033003
JournalPhysical review letters
Volume108
Issue number3
DOIs
Publication statusPublished - 2012 Jan 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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