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Phys. Rev. A 74, 037401 (2006) [2 pages]

Comment on “Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part I. Experimental study of multiphoton and single-photon processes”

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Dimitrios Charalambidis1,2, P. Tzallas1, N. A. Papadogiannis3, L. A. A. Nikolopoulos4, E. P. Benis1, and G. D. Tsakiris5
1Foundation for Research and Technology Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, 71110 Heraklion, Greece
2Physics Department, University of Crete, P.O. Box 2208, 71003 Heraklion, Greece
3Technological Educational Institution of Crete at Rethymnon, GR-74100, Rethymnon, Crete, Greece
4Department of Telecom, Science & Technology, University of Peloponnisos, GR-22100 Tripoli, Greece
5Max-Planck-Institut für Quantenoptik, D-85748 Garhing, Germany

Received 2 February 2006; published 6 September 2006

The reported observation of two-photon ionization of He by 13 eV photons of the TESLA Facility in Phys. Rev. A 72 023409 (2005) is ambiguous, as it is not supported by the experimental data presented. We discuss the lack of evidence for the claimed two-photon ionization.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.74.037401
DOI:
10.1103/PhysRevA.74.037401
PACS:
42.50.Hz

See Also

Original Article: T. Laarmann, A. R. de Castro, P. Gürtler, W. Laasch, J. Schulz, H. Wabnitz, and T. Möller,   Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part I. Experimental study of multiphoton and single-photon processes, Phys. Rev. A 72, 023409 (2005).

 
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