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Title: Surface Structure of Protonated R-Sapphire (1$$\bar{1}$$02) Studied by Sum-Frequency Vibrational Spectroscopy

Sum frequency vibrational spectroscopy was used to study the protonated R-plane (1$$\bar{1}$$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 (1$$\bar{1}$$02 ) surface differs from an ideal stoichimetric termination in a manner consistent with previous X-ray surface diffraction (crystal truncation rod) studies. However, in order to best explain the observed hydrogenbonding arrangement, surface oxygen spacing determined from the X-ray diffraction study requires modification.
Authors:
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Publication Date:
OSTI Identifier:
1082195
Report Number(s):
LBNL-5399E
Journal ID: ISSN 0002-7863
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 133; Journal Issue: 11; Related Information: Journal Publication Date: 2011
Publisher:
American Chemical Society (ACS)
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Earth Sciences Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE