The adsorption and desorption of hydrogen from diamond films were studied in ultrahigh vacuum using high resolution electron energy loss spectroscopy as a probe of surface vibrations. Auger electron and energy loss spectroscopies were also used to characterize the diamond surface. The samples studied were boron-doped polycrystalline diamond films with chiefly (111) oriented facets. We attribute the observed spectral features to a monohydride species and local sp3 bonding on the diamond surface exposed to atomic hydrogen. A significant fraction of the hydrogen desorbs from the surface between 950 and 1000 °C, although some hydrogen persists even after heating to 1050 °C.
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Thoms et al. (1994) studied this question.
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