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- Moshammer, R., et al.
(author)
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Few-photon multiple ionization of Ne and Ar by strong free-electron-laser pulses
- 2007
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 98:20, s. 203001-
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Journal article (peer-reviewed)abstract
- 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 < 6x10(12) W/cm(2) 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.
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