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Few-photon multiple ionization of ne and ar by strong free-electron-laser pulses |
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| Authors: | Moshammer R Jiang Y H Foucar L Rudenko A Ergler Th Schröter C D Lüdemann S Zrost K Fischer D Titze J Jahnke T Schöffler M Weber T Dörner R Zouros T J M Dorn A Ferger T Kühnel K U Düsterer S Treusch R Radcliffe P Plönjes E Ullrich J |
| Affiliation: | Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany. |
| 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/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. |
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