Study of Electron and UV Photon Surface Interactions. Progress Report, March 1, 1975--February 28, 1976 Page: 4 of 12
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"A Study of Electron and UV Photon Surface Interactions"
Principal Investigator: David Lichtman
PROGRESS REPORT.
ABSTRACT
Precise reproducible data has been .obtained on electron-
induced H+- and F+ from room temperature stainless steel for elec-
tron energies from 0-6,000 eV. Cross section versus energy curves
are quite similar to equivalent electron-gas .phase molecule inter-
action curves.. The main difference is that for EID for primary
electron energies greater than a few hundred eV, reflected primaries
and secondary electrons are the dominant contributors to the de-
sorption process. Data to date indicate maximum cross section
values for electron induced ion desorption of about 10 cm and
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for neutral desorption, of about 10 cm2.
A major effort utilizing primarily zinc oxide surfaces has
led to a much better understanding of the mechanism for photodesorp-
tion. .On many semiconductor surfaces (including the surfaces of
stainless steel) oxygen chemisorbs onto impurity carbon atoms.
Band-gap and higher energy radiation produce electron-hole pairs.
The holes migrate to the surface recombining with the electrons
involved in the chemisorption bond. The weakly bound physisorbed
CO2 is then thermally desorbed. Maximum cross sections for this
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process are the order of 10 cm.
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Lichtman, D. Study of Electron and UV Photon Surface Interactions. Progress Report, March 1, 1975--February 28, 1976, report, November 1, 1975; Milwaukee, Wisconsin. (https://digital.library.unt.edu/ark:/67531/metadc864898/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.