Electron Paramagnetic Resonance Study of GaAs Surfaces.
Abstract
The work has been devoted to using electron paramagnetic resonance (EPR) techniques to elucidate the nature of cleaved GaAs surfaces. When suitably covered with cesium and oxygen, they make efficient photoemitters of considerable practical value. An advanced experimental arrangement has been used to cleave specimens in ultra high vacuum (UHV) inside a microwave cavity while connected to a cryoprobe. The EPR signals from single crystals are several orders of magnitude smaller than from crushed powders studied hitherto. Nevertheless sufficient sensitivity has been obtained. The results indicate that oxygen adsorbs at low temperatures to form O2(-) ions with lesser probability than on surfaces of crushed powders. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1974
- Accession Number
- AD0782191
Entities
People
- D. Haneman
Organizations
- University of New South Wales