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' "

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A. R. B. de Castro,^1,2 T. Laarmann,² J. Schulz,² H. Wabnitz,² and T. Möller²
¹Laboratorio Nacional de Luz Sincrotron LNLS, 13084-971 Campinas SP, Brazil and Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas IFGW-UNICAMP, 13083-970 Campinas SP, Brazil
²Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany

Received 26 May 2006; published 1 August 2006

Wecannot agree with the Comment by Maquet et al. [Phys. Rev.A. 74, 027401 (2006)]. It seems that Maquet et al. arethinking in terms of classical fields. In our recent paperwe have presented a study of the two-photon rate ofHe making use of quantized fields. This approach becomes anatural choice if we have in mind processes at highphoton energy. In this description of the problem the squaredvector potential A·A term is essential.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.027402
DOI:	10.1103/PhysRevA.74.027402
PACS:	42.50.Hz; 33.60.Cv; 32.80.Rm 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift 33.60.Cv Ultraviolet and vacuum ultraviolet photoelectron spectra of molecules 32.80.Rm Multiphoton ionization and excitation to highly excited states in atoms e.g., Rydberg states YEAR: 2006
KEYWORDS:	photoionisation, helium neutral atoms, atom-photon collisions, multiphoton processes, free electron lasers

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N. V. Cohan and H. Hameka, Phys. Rev. 151, 1076 (1966).
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A. Scrinzi and B. Piraux, Phys. Rev. A 58, 1310 (1998).

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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"
Dimitrios Charalambidis, P. Tzallas, N. A. Papadogiannis et al.
Phys. Rev. A 74, 037401 (2006)
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)
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)