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' "

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T. Laarmann,¹ A. R. B. de Castro,² P. Gürtler,¹ W. Laasch,¹ J. Schulz,¹ H. Wabnitz,¹ and T. Möller¹
¹Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
²Laboratorio 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

Received 26 May 2006; published 6 September 2006

Wedo not agree with the conclusion of the Comment byCharalambidis et al. questioning our observation of two-photon ionization of heliumby intense radiation with 13 eV photons from a vuv free-electronlaser. Two-photon ionization is clearly established by the detection oflow-energy photoelectrons at ~1.7 eV, which agrees very well with theexpected energy for a two-photon ionization process.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.037402
DOI:	10.1103/PhysRevA.74.037402
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, photoelectron spectra, free electron lasers

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T. Laarmann, A. R. B. de Castro, J. Schulz, H. Wabnitz, and T. Möller, Phys. Rev. A 72, 023409 (2005).
V. Ayvazyan N. Baboi, I. Bohnet, R. Brinkmann, M. Castellano, P. Castro, L. Catani, S. Choroba, A. Cianchi, M. Dohlus, H. T. Edwards, B. Faatz, A. A. Fateev, J. Feldhaus, K. Flöttmann, A. Gamp, T. Garvey, H. Genz, Ch. Gerth, V. Gretchko, B. Grigoryan, U. Hahn, C. Hessler, K. Honkavaara, M. Hüning, R. Ischebeck, M. Jablonka, T. Kamps, M. Körfer, M. Krassilnikov, J. Krzywinski, M. Liepe, A. Liero, T. Limberg, H. Loos, M. Luong, C. Magne, J. Menzel, P. Michelato, M. Minty, U. Müller, D. Nölle, A. Novokhatski, C. Pagani, F. Peters, J. Pflüger, P. Piot, L. Plucinski, K. Rehlich, I. Reyzl, A. Richter, J. Rossbach, E. L. Saldin, W. Sandner, H. Schlarb, G. Schmidt, P. Schmüser, J. R. Schneider, E. Schneidmiller, H. -J. Schreiber, S. Schreiber, D. Sertore, S. Setzer, S. Simrock, R. Sobierajski, B. Sonntag, B. Steeg, F. Stephan, K. P. Sytchev, K. Tiedtke, M. Tonutti, R. Treusch, D. Trines, D. Türke, V. Verzilov, R. Wanzenberg, T. Weiland, H. Weise, M. Wendt, I. Will, S. Wolff, K. Wittenburg, M. V. Yurkov, and K. Zapfe, Phys. Rev. Lett. 88, 104802 (2002).
T. Laarmann, A. R. B. de Castro, P. Gürtler, W. Laasch, J. Schulz, H. Wabnitz, and T. Möller, Phys. Rev. Lett. 92, 143401 (2004).
T. Laarmann, M. Rusek, H. Wabnitz, J. Schulz, A. R. B. de Castro, P. Gürtler, W. Laasch, and T. Möller, Phys. Rev. Lett. 95, 063402 (2005).
H. Wabnitz, A. R. B. de Castro, P. Gürtler, T. Laarmann, W. Laasch, J. Schulz, and T. Möller, Phys. Rev. Lett. 94, 023001 (2005).
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A. R. B. de Castro, T. Laarmann, J. Schulz, H. Wabnitz, and T. Möller, Phys. Rev. A 72, 023410 (2005).

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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)
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)