Abstract
Hydrogen, oxygen, and halogen chemisorption states on a diamond surface are investigated by three different vibrational spectroscopies; (i) Fourier-transform Infrared (FTIR), (ii) High-resolution Electron Energy Loss Spectroscopy (HREELS), and (iii) Sum-frequency Generation Spectroscopy (SFG). Diffuse reflectance FTIR and Photoacoustic FTIR are effective for use with the powder diamond samples with large surface areas. Diffuse reflectance and photoacoustic FTIR have clarified a lot of the chemisorption structures of hydrogen, oxygen and fluorine chemisorption on powdered polycrystalline diamond surfaces. HREELS is a powerful technique to observe species on single crystal diamond surfaces with small surface areas. HREE-LS has revealed a characteristic feature of hydrogen chemisorption on (100) and (111) diamond surfaces. SFG is a quite new spectroscopic technique using both a frequency fixed visible laser and a frequency tunable infrared laser to study single crystal diamond surfaces, even in a reactive gas environment. In this review, we introduce these three different vibrational spectroscopies as techniques to study diamond surface chemisorption.
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