Abstract
The electron affinity $\ensuremath{\chi}$ and the band diagram of single crystal diamond (111) surfaces was determined as a function of hydrogen coverage by combining work function measurements with photoelectron yield and core level photoemission spectroscopy. $\ensuremath{\chi}$ ranges from $\ensuremath{-}1.27\mathrm{eV}$ for the fully hydrogen covered $(1\ifmmode\times\else\texttimes\fi{}1)$ surface to $+0.38\mathrm{eV}$ for the hydrogen free $(2\ifmmode\times\else\texttimes\fi{}1)$ reconstructed surface. This change is quantitatively explained by a surface dipole model provided a coverage dependent depolarization is included. The dipole moment of the C-H bond on diamond (111) is found to be $0.09e\AA{}$.
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