Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
51 (1987), S. 964-966
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The current model for hydrocarbon formation upon the interaction of energetic hydrogen ions with graphite assumes a reaction of adsorbed hydrogen with carbon surface atoms requiring a temperature of 800–900 K. This model is strongly questioned by results of hydrocarbon formation from a layered 13C/12C sample and by desorption measurements after room-temperature implantation. The formation of 13CD4 and 12CD4 is monitored during deuterium bombardment of a pyrolytic graphite sample covered with a layer of 200 A(ring) of 13C. Only for ion energies corresponding to ranges smaller than 200 A(ring) 13CD4 dominates, while at higher energies only 12CD4 is found. The methane is thus formed at the end of ion range rather than in a surface reaction of back-diffusing ions. Desorption experiments using a slow temperature range after room-temperature implantation show the release of CD4 prior to D2, thus indicating a diffusion-limited release of CD4 already formed during the implantation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.98777
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