Photodesorption from powdered zinc oxide

Y. Shapira*, S. M. Cox, David Lichtman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Mass spectrometric measurements of photodesorption from powdered ZnO under controlled radiation are reported. Neutral carbon dioxide and atomic oxygen prevail as the desorbing species. From photodesorption rate decay curves we obtain cross sections for photodesorption of ~ 2 × 10-17 cm2 for O and ~4 × 10-19 cm2 for CO2. Both species desorb only when the incoming photon energy exceeds the ZnO band gap energy (3.2 eV). The desorption rate is linear with incoming photon flux. All the data seem to support a substrate dependent process of photodesorption by neutralization of chemisorbed species by photogenerated holes. The temperature dependence of the photodesorption rate for CO2 yields a value of 0.26 eV for the apparent binding energy of the physisorbed CO2 molecule.

Original languageEnglish
Pages (from-to)503-514
Number of pages12
JournalSurface Science
Volume50
Issue number2
DOIs
StatePublished - Jun 1975
Externally publishedYes

Funding

FundersFunder number
A.E.C.-2425-l
N.S.F.

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