| Abstract
| - The interaction of water vapor on clean diamond (100) has been studied using ultraviolet photoemissionspectroscopy (UPS), X-ray photoemission spectroscopy (XPS), X-ray-absorption near-edge structure (XANES)spectroscopy, and high-resolution electron energy loss spectroscopy (HREELS). It is shown that waterdissociates at room temperature on clean diamond forming C−H and C−OH bonds, resulting in a surfacedipole layer which produces the condition of negative electron affinity (NEA). The strong polarizationdependence of the O K XANES could be associated with the out-of-plane orientation of the OH bonds.Density functional theory (DFT) calculations confirm the existence of NEA on this surface with a mixture ofhydrogen and hydroxyl (OH) terminations.
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