Abstract
TOF spectra of scattered primary and surface recoiled neutrals and ions for 3 keV Ar+ bombardment of clean La and Yb and H2, O2, and H2O saturated La surfaces are presented. The spectra are analyzed in terms of single (SS) and multiple (MS) scattering of the primary ions and surface recoiling (SR) of adsorbate atoms. Measurement of spectra of neutrals + ions and neutrals alone allows determination of scattered ion fractions Y. The Y values for the SS event are high for clean La (37%) and lower for adsorbate covered La (32% for H2, 13% for O2, and 8% for H2O); Yb exhibits a similar behavior, i.e. 16% for clean Yb and 5% for O2 + H2O covered Yb. Photon emission accompanying the scattering collision has been observed from clean La and Yb and adsorbate covered La. A preferential inelastic energy loss of 15 ± 3 eV for the SS event has been observed for scattered neutrals as opposed to ions for La and H2 saturated La at 135°. These results are interpreted within the models for Auger and resonant electronic charge exchange transitions during approach or departure of an ion with a surface and the electron promotions occuring during close atomic encounters where the electron shells are interpenetrating.
Original language | English |
---|---|
Pages (from-to) | 15-36 |
Number of pages | 22 |
Journal | Surface Science |
Volume | 147 |
Issue number | 1 |
DOIs | |
State | Published - 2 Nov 1984 |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry