Accession Number : ADA266415
Title : Water Adsorption on Diamond (110) Studied by Multiple Internal Reflection Infrared Spectroscopy
Descriptive Note : Memorandum rept.
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : McGonigal, M ; Russell, Jr , J N ; Pehrsson, P E ; Maguire, H ; Butler, J E
Report Date : 14 Jun 1993
Pagination or Media Count : 15
Abstract : The adsorption of water on a natural, type IIa diamond (110) surface is studied by multiple internal reflection infrared spectroscopy (MIRIRS). Similar results are observed for the hydrogen-free, and hydrogen-terminated diamond (110) surfaces. Exposure of water at 100 K reveals the presence of physisorbed molecular water on the surface, with no evidence of dissociation. Upon heating to approximately 160 K, the water is desorbed from the surface without any evidence of chemisorption or decomposition. Exposure of the surface to water at elevated temperatures (373 and 773 K) also failed to produce any evidence in the infrared spectra of chemisorption or decomposition. However, the absence of water dissociative chemisorption may be the result of sp2 carbon contamination which was found on the surface at the conclusion of the experiments. Diamond, Multiple internal reflection infrared spectroscopy, Water.
Descriptors : *INFRARED SPECTROSCOPY , *WATER , *ADSORPTION , *INTERNAL REFLECTION , *DIAMONDS , TEMPERATURE , SPECTROSCOPY , VAPOR DEPOSITION , CARBON , ATOMIC ORBITALS , HYDROGEN , SURFACES , SPECTRA , CHEMICAL REACTIONS , HEATING , CONTAMINATION , DISSOCIATION , DESORPTION , DECOMPOSITION , INFRARED SPECTRA , CHEMISORPTION , ATOMIC STRUCTURE
Subject Categories : Inorganic Chemistry
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE