Desorption from powdered ZnO during electron bombardment and interaction with atomic hydrogen

P. Morgen*, J. H. Onsgaard, S. Tougaard

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Electron bombardment of ZnO powder leads to desorption of CO2. The presence of CO2 molecules at ZnO surfaces after chemisorption of oxygen was recently established from photodesorption experiments, leading to the conclusion that carbon impurities were active during oxygen chemisorption. Atomic hydrogen has earlier been found to chemisorb on ZnO single crystals, the adsorbed atoms acting as electron donors. We have tried to evaluate the possible influence of carbon impurities on this reaction with ZnO powder. It was found that adsorption of hydrogen atoms causes an increase of conductance, accompanied by desorption of CO and O. No significant desorption of CO2 was found.

Original languageEnglish
JournalJournal of Applied Physics
Volume48
Issue number8
Pages (from-to)3443-3447
Number of pages5
ISSN0021-8979
DOIs
Publication statusPublished - 1. Dec 1977

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