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- W2078588044 abstract "Abstract In the present study, we investigated the mechanisms of state-selective fragment-ion desorption from condensed chlorobenzene following C 1s, Cl 2s, and Cl 2p core-level excitations by measuring the polarization dependences of NEXAFS (near-edge X-ray absorption fine structure) spectra recorded with desorbed ion yields and total electron yields (TEY). TEY-based NEXAFS shows no significant polarization dependence at any edges. In contrast, ion-based NEXAFS demonstrates a variety of marked polarization dependences. Cl 2p → 3d π* excitation induces a significant enhancement of Cl + desorption yield at normal incidence (polarization ∥ surface), while Cl 2s → σ*(C–Cl) excitation stimulates a substantial enhancement of Cl + desorption at grazing incidence (polarization ⊥ surface). C 1s → σ*(C–Cl) enhances D + desorption at grazing incidence, while C 1s → π*(C C) suppresses D + desorption at all angles. All polarization dependences consistently reveal that excited molecules with upward-pointing bonds at top-most surfaces lead to efficient fragment desorption. This orientation effect is understood in terms of competing processes between the ultra-fast dissociation and charge-neutralization relaxation taking place during core-excited states. We demonstrate that the polarization-dependent ion-NEXAFS technique can distinguish direct state-specific fragmentation from indirect desorption caused by the collision of secondary electrons." @default.
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- W2078588044 date "2005-11-01" @default.
- W2078588044 modified "2023-09-27" @default.
- W2078588044 title "Mechanism of state-specific enhancement in photon-stimulated desorption as studied using a polarization-dependent technique" @default.
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- W2078588044 doi "https://doi.org/10.1016/j.susc.2005.06.076" @default.
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