Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

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Bibtex

@article{6a127c06a662494a9a1c966f50996e94,
title = "Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses",
abstract = "The two-photon ionization of helium atoms by ultrashort extreme-ultraviolet free-electron laser pulses, produced by the SPring-8 Compact SASE Source test accelerator, was investigated at photon energies of 20.3, 21.3, 23.0 and 24.3 eV. The angular distribution of photoelectrons generated by two-photon ionization is obtained using a velocity map imaging spectrometer. The phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets are extracted from the photoelectron angular distributions. The obtained values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to a resonance with an excited level or Rydberg manifold. The difference stems from the co-presence of resonant and non-resonant path contributions in the two-photon ionization by femtosecond pulses. Since the relative contribution of both paths can be controlled in principle by the pulse shape, these results illustrate a new way to tailor the continuum wave packet.",
author = "R. Ma and K. Motomura and Ishikawa, {K. L.} and S. Mondal and H. Fukuzawa and A. Yamada and K. Ueda and K. Nagaya and S. Yase and Y. Mizoguchi and M. Yao and A. Rouze and A. Hundermark and Vrakking, {M. J. J.} and Per Johnsson and M. Nagasono and K. Tono and T. Togashi and Y. Senba and H. Ohashi and M. Yabashi and T. Ishikawa",
year = "2013",
doi = "10.1088/0953-4075/46/16/164018",
language = "English",
volume = "46",
journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",
issn = "0953-4075",
publisher = "IOP Publishing",
number = "16",

}