Physics – Atomic Physics
Scientific paper
2012-04-21
Physics
Atomic Physics
5 pages, 3 figures
Scientific paper
Phase-shift differences and amplitude ratios of the outgoing $s$ and $d$ continuum wave packets generated by two-photon ionization of helium atoms are determined from the photoelectron angular distributions obtained using velocity map imaging. Helium atoms are ionized with extreme-ultraviolet free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3 eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to an excited level or Rydberg manifold, in accordance with a recent theoretical prediction [Ishikawa and Ueda, Phys. Rev. Lett. 108, 033003 (2012)]. The present results unambiguously demonstrate the existence of a competition between resonant and non-resonant paths in two-photon ionization by ultrashort pulses.
Fukuzawa Hironobu
Hundermark A.
Ishikawa Kenichi L.
Ishikawa Tadashi
Johnsson Per
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