Few-photon multiple ionization of Ne and Ar atoms by strong vacuum ultraviolet laser pulses from the free-electron laser at Hamburg was investigated differentially with the Heidelberg reaction microscope. The light-intensity dependence of Ne2+ production reveals the dominance of nonsequential two-photon double ionization at intensities of I< 6 x 1012W/cm2 and significant contributions of three-photon ionization as I increases. Ne2+ recoil-ion-momentum distributions suggest that two electrons absorbing "instantaneously" two photons are ejected most likely into opposite hemispheres with similar energies.
"Few-Photon Multiple Ionization of Ne and Ar by Strong Free-Electron-Laser Pulses," Physical Review Letters, vol. 98, no. 20, pp. 203001-1-203001-4, American Physical Society (APS), May 2007.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.98.203001
Keywords and Phrases
Argon; Electron Absorption; Free Electron Lasers; Laser Pulses; Neon; Ultraviolet Radiation; Heidelberg Reaction Microscope; Two Photon Double Ionization; Ultraviolet Laser Pulses; Photoionization
International Standard Serial Number (ISSN)
Article - Journal
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