Mechanisms of CO ejection from ion bombarded single crystal surfaces
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Authors
Winograd, N.
Garrison, B.J.
Harrison, D. E.
Subjects
Advisors
Date of Issue
1980
Date
Publisher
AIP Publishing
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Abstract
We have calculated the response of a model Ni(OOI) microcrystallite to 600 eV Ar+ ion bombardment when it is covered with 0.5 monolayer of CO. Calculations were performed using a standard molecular dynamics treatment which employs pair potentials fit to the elastic constants of the solid to evaluate Hamilton's equations of motion. The model microcrystallite contained ~240 atoms. The CO was adsorbed in a c(2X2) coverage in both an atop or linear bonded and a twofold bridge bonded position with a binding energy to the surface of 1.3 eV. The results showed that most of the CO molecules eject molecularly, although a few (~10%-15%) eject dissociatively if they are hit directly with the primary ion or with other energetic solid atoms. We also found that NiCO as well as Ni₂CO and Ni₃CO formation probably occurs over the surface via interaction between Ni and CO species, and that the probability of NiC or NiO clusters ejected from a CO covered surface is extremely low.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1063/1.440499
Series/Report No
Department
Physics and Chemistry
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NPS Report Number
Sponsors
National Science Foundation
U. S. Air Force Office of Scientific Research
The Petroleum Research Fund, Administered by the American Chemical Society
U. S. Air Force Office of Scientific Research
The Petroleum Research Fund, Administered by the American Chemical Society
Funding
(Grant No. CHE-79- 19605 and CHE-7820474)
(Grant No. AFOSR 80-0002)
(Contract No. W-7405-ENG-48)
(Grant No. AFOSR 80-0002)
(Contract No. W-7405-ENG-48)
Format
8 p.
Citation
Winograd, N., B. J. Garrison, and D. E. Harrison Jr. "Mechanisms of CO ejection from ion bombarded single crystal surfaces." The Journal of Chemical Physics 73.7 (1980): 3473-3479.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.