Phys. Rev. Lett. 94, 023001 (2005) [4 pages]Multiple Ionization of Rare Gas Atoms Irradiated with Intense VUV RadiationReceived 29 January 2004; published 18 January 2005 The interaction of intense vacuum-ultraviolet radiation from a free-electron laser with rare gas atoms is investigated. The ionization products of xenon and argon atomic beams are analyzed with time-of-flight mass spectroscopy. At 98 nm wavelength and ∼1013 W/cm2 multiple charged ions up to Xe6+ (Ar4+) are detected. From the intensity dependence of multiple charged ion yields the mechanisms of multiphoton processes were derived. In the range of ∼1012–1013 W/cm2 the ionization is attributed to sequential multiphoton processes. The production of multiple charged ions saturates at 5–30 times lower power densities than at 193 and 564 nm wavelength, respectively. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.023001
DOI:
10.1103/PhysRevLett.94.023001
PACS:
32.80.Rm, 42.65.–k
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