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28 March 2024
 
  » arxiv » 1204.4812

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Experimental Evidence of the Competition Between Resonant and Non-resonant Paths in Two-Photon Ionization by Extreme Ultraviolet Free Electron Laser Pulses
R. Ma ; K. Motomura ; K. L. Ishikawa ; H. Fukuzawa ; A. Yamada ; K. Ueda ; K. Nagaya ; S. Yase ; Y. Mizoguchi ; M. Yao ; A. Rouzée ; A. Hundermark ; M. J. J. Vrakking ; P. Johnsson ; M. Nagasono ; K. Tono ; T. Togashi ; Y. Senba ; H. Ohashi ; M. Yabashi ; T. Ishikawa ;
Date 21 Apr 2012
AbstractPhase-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.
Source arXiv, 1204.4812
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