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- W1993552102 abstract "Inelastic scattering and electron-exchange processes in low-energy (0.1--1 keV) ${mathrm{He}}^{+}$ scattering from surfaces of ionic compounds and metallic elements have been investigated. The probability for ionization of neutral ${mathrm{He}}^{0}$ in the ground state is minimized for target elements which have filled d orbitals located in a shallower energy position than the He 1s level. Inelastic scattering other than reionization of ${mathrm{He}}^{0}$ is also clearly observed in the spectra from a large number of ionic compounds. These excitations are observed provided that the surface p levels are located at lower energies than the He 1s level and that ionization of ${mathrm{He}}^{0}$ takes place with a large probability. On the basis of the quasimolecular framework, it is found that the inelastic scattering is caused by excitation of surface p electrons along the ensuremath{sigma} orbital, which is promoted due to the antibonding interaction with the He 1s orbital. The quantum-mechanical interference between bonding and antibonding orbitals, which results in oscillatory-yield--versus--kinetic-energy curves because of the quasiresonant charge exchange, is found to be broken down by the intervening occurrence of the inelastic process." @default.
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- W1993552102 date "1989-08-15" @default.
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- W1993552102 title "Electronic excitation in impact scattering of low-energy<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>from solid surfaces" @default.
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- W1993552102 doi "https://doi.org/10.1103/physrevb.40.4119" @default.
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