Investigation of the Enhanced Sensitivity of LEPD to Hydrogen on Hydrogen-Terminated Diamond (100)
Abstract
In general, low energy electron elastic scattering from hydrogen on semiconductors is too weak, relative to scattering from the substrate atoms, to directly reveal itself in I-V profiles. In stark contrast, the positive charge of the positron leads to scattering phase shifts which have only minor dependence on the atomic number of imbedded atoms(Duke and Lessor, Surf. Sci. 225 (1990) 81). Hence the interference term between substrate and adsorbate hydrogen should be maximal. We have taken LEPD I-V data from temperature hydrogen-terminated diamond(100) and are now carrying out a preliminary simplified kinematic diffraction analysis to demonstrate the sensitivity of LEPD data to the presence of hydrogen on diamond surfaces. The possibility of applying the hydrogen sensitivity to the issue of dihydried and monohydride terminated diamond (100) will also be discussed (Hamza, Kubiak and Stulen, Surf. Sci. 237 (1990) 35). Work supported by NSF grant DMR-9501210
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.S2805K