Phys. Rev. A 74, 037402 (2006) [2 pages]

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’ ”

Abstract

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Citing Articles (3)

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T. Laarmann^1,*, A. R. B. de Castro², P. Gürtler¹, W. Laasch¹, J. Schulz^1,†, H. Wabnitz¹, and T. Möller^1,‡
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

We do not agree with the conclusion of the Comment by Charalambidis et al. questioning our observation of two-photon ionization of helium by intense radiation with 13 eV photons from a vuv free-electron laser. Two-photon ionization is clearly established by the detection of low-energy photoelectrons at ∼1.7 eV, which agrees very well with the expected 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

^*Present address: Max-Born-Institute, Max-Born Str. 2a, D-12489 Berlin, Germany.

^†Present address: MAX-lab, Box 118, 22100 Lund, Sweden.

^‡Present address: Institut for Atomic Physics PN 3.1, TU-Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany.

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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Phys. Rev. A 74, 037402 (2006) [2 pages]

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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