Electron ejection mechanism in the He 2 3S interaction with a clean and a molecularly covered Ni(111) surface
Abstract
The energy distributions of electrons ejected during the deexcitation of He 2 3S on a clean Ni(111) surface and on CO- and NO-covered Ni(111) surfaces were measured. The experimental apparatus was carefully designed so that the beam incident on the target was well defined (both from the beam components and the beam geometry points of view) and so that the transmission coefficient encountered in the electron analysis could be taken into account correctly. The deexcitation on the clean surface is demonstrated to be of the (RI + AN) type. On the molecularly covered surface, the ejected electrons are due to (AD) type deexcitation. The He 2 3S reflection coefficient is very low and only an upper limit of the order of 10 -4 could be established.
- Publication:
-
Surface Science
- Pub Date:
- October 1981
- DOI:
- 10.1016/0039-6028(81)90635-X
- Bibcode:
- 1981SurSc.110L.634R