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Full-Text Articles in Physical Sciences and Mathematics
Triply Differential Ionization Of Ar By 500 Ev Positron And Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Triply Differential Ionization Of Ar By 500 Ev Positron And Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Physics Faculty Research & Creative Works
Coincidences between recoil ions-ejected electrons and recoil ions-scattered projectiles have been used to study the kinematics of electron and positron impact ionization. Triply Differential (TDCS) data for 500 eV positron and electron impact on Ar are presented here as function of scattering angle for a given range of energy losses. Binary and recoil interactions can be distinguished allowing us to determine the relative intensity between those interactions. Preliminary integration of the data indicate an enhancement of the binary region for positron interaction while for electron impact the intensity of the recoil and binary interactions is comparable.
Few-Photon Multiple Ionization Of Ne And Ar By Strong Free-Electron-Laser Pulses, Robert Moshammer, Yuhai Jiang, L. Foucar, Artem Rudenko, Th. Ergler, Claus Dieter Schroter, S. Ludemann, Karl Zrost, Daniel Fischer, J. Titze, Till Jahnke, Markus S. Schoffler, Th Weber, Reinhard Dorner, Theo J.M. Zouros, Alexander Dorn, T. Ferger, Kai Uwe Kuhnel, S. Dusterer, R. Treusch, Paul Radcliffe, Elke Plonjes, Joachim Hermann Ullrich
Few-Photon Multiple Ionization Of Ne And Ar By Strong Free-Electron-Laser Pulses, Robert Moshammer, Yuhai Jiang, L. Foucar, Artem Rudenko, Th. Ergler, Claus Dieter Schroter, S. Ludemann, Karl Zrost, Daniel Fischer, J. Titze, Till Jahnke, Markus S. Schoffler, Th Weber, Reinhard Dorner, Theo J.M. Zouros, Alexander Dorn, T. Ferger, Kai Uwe Kuhnel, S. Dusterer, R. Treusch, Paul Radcliffe, Elke Plonjes, Joachim Hermann Ullrich
Physics Faculty Research & Creative Works
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.