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 Charalambidis,^1,2 P. Tzallas,¹ N. A. Papadogiannis,³ L. A. A. Nikolopoulos,⁴ E. P. Benis,¹ 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

Thereported observation of two-photon ionization of He by 13 eV photonsof the TESLA Facility in T. Laarmann, A. R. B.de Castro, P. Gürtler, W. Laasch, J. Schulz, H. Wabnitz,and T. Möller, Phys. Rev. A72, 023409 (2005) is ambiguous,as it is not supported by the experimental data presented.We discuss the lack of evidence for the claimed two-photonionization.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.037401
DOI:	10.1103/PhysRevA.74.037401
PACS:	42.50.Hz 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift YEAR: 2006
KEYWORDS:	photoionisation, helium neutral atoms, atom-photon collisions, multiphoton processes, free electron lasers

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T. Laarmann, A. R. B. de Castro, P. Gürtler, W. Laasch, J. Schulz, H. Wabnitz, and T. Möller, Phys. Rev. A 72, 023409 (2005).
T. Sekikawa, T. Katsura, S. Miura, and S. Watanabe, Phys. Rev. Lett. 88, 193902 (2002).
N. A. Papadogiannis, L. A. A. Nikolopoulos, D, Charalambidis, G. D. Tsakiris, P. Tzallas, and K. Witte, Phys. Rev. Lett. 90, 133902 (2003).

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Reply to "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' "
T. Laarmann, A. R. B. de Castro, P. Gürtler et al.
Phys. Rev. A 74, 037402 (2006)
Comment on "Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part II. Theoretical modeling of multiphoton and single-photon processes"
Alfred Maquet, Bernard Piraux, Armin Scrinzi et al.
Phys. Rev. A 74, 027401 (2006)
Reply to "Comment on `Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part II. Theoretical modeling of multiphoton and single-photon processes' "
A. R. B. de Castro, T. Laarmann, J. Schulz et al.
Phys. Rev. A 74, 027402 (2006)
Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part I. Experimental study of multiphoton and single-photon processes
T. Laarmann, A. R. B. de Castro, P. Gürtler et al.
Phys. Rev. A 72, 023409 (2005)
Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part II. Theoretical modeling of multi-photon and single-photon processes
A. R. B. de Castro, T. Laarmann, J. Schulz et al.
Phys. Rev. A 72, 023410 (2005)