Abstract
Abstract The H-D isotope exchange reaction of chemisorbed species on diamond surfaces has been investigated by diffuse reflectance Fourier-transform IR spectroscopy and temperature-programmed reaction mass spectrometry using powdered diamond. C-H stretching vibrations are observed in the region 2700–3000 cm−1 and C-D stretching vibrations are observed in the region 2000–2250 cm−1. The CH-CD exchange reaction of the pre-hydrogenated diamond with molecular deuterium (CD-CH exchange reaction of the pre-deuterated diamond with molecular hydrogen) was performed. Both reactions occur on the diamond surface above 450 °C. HD formation is observed in the vapor phase during the exchange reaction.
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