J. Vanderweide et Rj. Nemanich, ARGON AND HYDROGEN PLASMA INTERACTIONS ON DIAMOND (111) SURFACES - ELECTRONIC STATES AND STRUCTURE, Applied physics letters, 62(16), 1993, pp. 1878-1880
Photoemission spectroscopy was used to compare the effects of a hydrog
en or argon plasma on natural-type 2B diamond (111) surfaces, while th
e diamond was heated to 350-degrees-C. After the hydrogen plasma the s
urface exhibits a negative electron affinity, indicative of a hydrogen
-terminated surface. In contrast, the argon plasma was found to result
in a surface with a positive electron affinity of 1.0 eV, indicating
the removal of hydrogen from the surface. Features characteristic of g
raphite were not observed. After reexposing the surface to a hydrogen
plasma, the spectrum was identical to the spectrum obtained after the
initial hydrogen plasma.