Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
100 (1994), S. 8425-8431
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The processes of atomic hydrogen adsorption and abstraction on a diamond surface determine the fraction of sites available for reaction with carbon containing species during growth. The relative efficiencies of hydrogen atom adsorption and abstraction on a polycrystalline diamond surface were determined at surface temperatures of 80 and 600 °C using high resolution electron energy loss spectroscopy. Abstraction is seen to occur 0.05 times as efficiently as adsorption on a diamond surface at 80 °C. This is interpreted to indicate that the activation barrier to abstraction is higher than in analogous gas phase reactions. No change in either the adsorption or abstraction rate is seen for a diamond surface at 600 °C indicating that hydrogen atoms do not accommodate the surface during the reaction. Thus, abstraction proceeds via a generalized Eley–Rideal mechanism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.466740
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