Surface Structure of Protonated R-Sapphire (11虆02) Studied by Sum-Frequency Vibrational Spectroscopy

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• 作者：Jaeho Sung ; Luning Zhang ; Chuanshan Tian ; Glenn A. Waychunas ; Y. Ron Shen
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：March 23, 2011
• 年：2011
• 卷：133
• 期：11
• 页码：3846-3853
• 全文大小：1042K
• 年卷期：v.133,no.11(March 23, 2011)
• ISSN：1520-5126

文摘

Sum-frequency vibrational spectroscopy was used to study the protonated R-plane (11虆02) sapphire surface. The OH stretch vibrational spectra show that the surface is terminated with three hydroxyl moieties, two from AlOH₂ and one from Al₂OH functional groups. The observed polarization dependence allows determination of the orientations of the three OH species. The results suggest that the protonated sapphire (11虆02) surface differs from an ideal stoichiometric termination in a manner consistent with previous X-ray surface diffraction (crystal truncation rod) studies. However, in order to best explain the observed hydrogen-bonding arrangement, surface oxygen spacing determined from the X-ray diffraction study requires modification.