Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states
MetadataShow full item record
Fine details of the cross section for electron-impact ionization of metastable two-electron Li+ (1s2s 3S1) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double-K-vacancy (hollow) states either in a Li+ ion or in a neutral lithium atom and subsequent emission of one or two electrons, respectively, can contribute to the net production of Li2+ ions. The partial cross sections for such contributions are less than 4% of the total single-ionization cross section. The characteristic steps, resonances, and interference phenomena in the indirect ionization contribution are measured with an experimental energy spread of less than 0.9 eV and with a statistical relative uncertainty of the order of 1.7%, requiring a level of statistical uncertainty in the total single-ionization cross section of better than 0.05%. The measurements are accompanied by convergent-close-coupling calculations performed on a fine energy grid. Theory and experiment are in remarkable agreement concerning the fine details of the ionization cross section. Comparison with previous R-matrix results is less favorable.
Showing items related by title, author, creator and subject.
Propensity for distinguishing two free electrons with equal energies in electron-impact ionization of heliumRen, X.; Senftleben, A.; Pflüger, T.; Bartschat, K.; Zatsarinny, O.; Berakdar, J.; Colgan, J.; Pindzola, M.; Bray, I.; Fursa, Dmitry; Dorn, A. (2015)©2015 American Physical Society. We report a combined experimental and theoretical study on the electron-impact ionization of helium at E0=70.6eV and equal energy sharing of the two outgoing electrons (E1=E2=23eV), where ...
Abdurakhmanov, Ilkhom (2011)This thesis is devoted to extension of the convergent close-coupling (CCC) method to heavy projectiles and its application to the theoretical studies of antiproton scattering on the hydrogen and helium targets.In the ...
Abdurakhmanov, Ilkhom; Kadyrov, Alisher; Bray, Igor (2016)© 2016 IOP Publishing Ltd. An accurate solution to the fundamental three-body problem of proton-hydrogen scattering including direct scattering and ionization, electron capture and electron capture into the continuum (ECC) ...