Supression of electron-induced positive ion emission by a molecular overlayer: Ion-molecule charge exchange at a surface
- Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855-0849 (United States)
We report the suppression of electron-stimulated desorption of positive ions (O[sup +] and F[sup +]) from a TiO[sub 2] (110) surface caused by adsorption of a fractional monolayer of molecular NH[sub 3]. A linear decrease of O[sup +] and F[sup +] emission with NH[sub 3] coverage is observed. This system allows us to distinguish between neutralization of desorbing ions via interaction with the substrate or with adsorbed molecules. We propose a novel charge exchange mechanism where electron transfer from the occupied orbitals of the adsorbed molecules to the desorbing ions causes the decrease in detected ion yield. Charge transfer cross sections of 2.8([plus minus]0.5) and 2.7([plus minus]1) ([times]10[sup [minus]15]) cm[sup 2] have been determined for O[sup +] and F[sup +] ions, respectively.
- OSTI ID:
- 5172075
- Journal Information:
- Physical Review Letters; (United States), Vol. 72:7; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
TITANIUM OXIDES
CHARGE-EXCHANGE INTERACTIONS
ADSORPTION
CATIONS
CROSS SECTIONS
DESORPTION
ELECTRON COLLISIONS
ELECTRON TRANSFER
ION-MOLECULE COLLISIONS
NITROGEN HYDRIDES
SURFACE PROPERTIES
BASIC INTERACTIONS
CHALCOGENIDES
CHARGED PARTICLES
COLLISIONS
HYDRIDES
HYDROGEN COMPOUNDS
INTERACTIONS
ION COLLISIONS
IONS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SORPTION
STRONG INTERACTIONS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
665300* - Interactions Between Beams & Condensed Matter- (1992-)