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Atomic hydrogen (deuterium) adsorbed onto the diamond C (111) surface has been studied by infrared-visible sum-frequency-generation spectroscopy. Monohydride termination of H/C (111) is confirmed by the observation of sharp CH stretch (2838 cm^-1) and CH bend (1331 cm^-1) modes in the spectrum. Deuterium on the surface gives a CD stretch frequency of 2115 cm^-1. The rate of hydrogen adsorption is measured in comparison with the rate of deuterium abstraction by hydrogen. Measurement of thermal desorption of hydrogen from C (111) suggests a near first-order desorption kinetics with an activation energy of 4. 00. 4 eV and a preexponential factor of 10^152 s^-1. On the bare reconstructed C (111) surface, distinct CC surface phonon features characteristic of the (21) -reconstructed surface are seen, which seem to support the modified Pandey model of Bechstedt and Reichardt.
Chin et al. (Tue,) studied this question.