An investigation of the surface reactivity of diamond photocathodes with molecular and atomic oxygen species

An investigation of the surface reactivity of diamond photocathodes with molecular and atomic oxygen species

The surface reactivity of CVD diamond films, which function as UV photocathodes, with thermal and electronically excited O 2, as well as atomic oxygen, has been explored. The CVD films show a low, but measurable reactivity with O 2, which increases markedly with electronic excitation, to form dilute...

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Bibliographic Details
Published in:Diamond and related materials Vol. 10; no. 3; pp. 710 - 714
Main Authors: Foord, J.S., Hian, L.C., Jackman, R.B.
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 01-03-2001
Elsevier
Subjects:
Chemistry
Diamond films
Electron affinity
Exact sciences and technology
General and physical chemistry
Photochemistry
Photoelectrical
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Solid-gas interface
Surface
Surface physical chemistry
Electron affinity
Diamond films
Photoelectrical
Surface
Oxygen
Oxygen Molecules
Film
Photocathode
Diamond
X ray
Oxygen Atoms
Chemical vapor deposition
Ultraviolet radiation
Surface properties
Photoelectron spectrometry
Photoelectric
Chemical reactivity
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Summary:The surface reactivity of CVD diamond films, which function as UV photocathodes, with thermal and electronically excited O 2, as well as atomic oxygen, has been explored. The CVD films show a low, but measurable reactivity with O 2, which increases markedly with electronic excitation, to form dilute oxygen adlayers which are stable thermally to 800 K. In contrast, reaction with atomic O produces significantly higher surface concentrations of oxygen, although these adlayers decompose thermally below 500 K, evolving CO 2. Greater surface reaction probabilities are observed if the diamond surface is pre-hydrogenated before interaction with oxygen. The consequences of these observations for the stable operation of H-terminated diamond photocathodes are discussed.
ISSN:0925-9635
1879-0062
DOI:10.1016/S0925-9635(00)00605-1