Phys. Rev. Lett. 99, 213002 (2007) [4 pages]Photoelectric Effect at Ultrahigh IntensitiesReceived 20 April 2007; published 20 November 2007 In the spectral range of the extreme ultraviolet at a wavelength of 13.3 nm, we have studied the photoionization of xenon at ultrahigh intensities. For our ion mass-to-charge spectroscopy experiments, irradiance levels from 1012 to 1016 W cm-2 were achieved at the new free-electron laser in Hamburg FLASH by strong beam focusing with the aid of a spherical multilayer mirror. Ion charges up to Xe21+ were observed and investigated as a function of irradiance. Our surprising results are discussed in terms of a perturbative and nonperturbative description. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.213002
DOI:
10.1103/PhysRevLett.99.213002
PACS:
32.80.Rm, 32.80.Fb, 41.60.Cr, 42.50.Hz
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