Comrie, C. M. and Weinberg, W. H. (1976) CO chemisorption on Ir(111). Journal of Vacuum Science and Technology, 13 (1). pp. 264-265. ISSN 0022-5355 http://resolver.caltech.edu/CaltechAUTHORS:20120808-074221649
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The adsorption of carbon monoxide on the (111) crystallographic orientation of iridium both at and below room temperature has been investigated using both low‐energy electron diffraction (LEED) and thermal desorption mass spectrometry. At room temperature, CO adsorbs rapidly resulting in the appearance of a faint (√3×√3) R30° LEED pattern after only approximately 1.3×10^(−6) Torr s (1.72×10^(−4) Pa s) exposure. Upon further exposure to CO, the intensity of the overlayer LEED beams initially increases, but then decreases passing through a maximum at an exposure of approximately 2.4×10^(−6) Torr s (3.2×10^(−4) Pa s). By an exposure of 10^(−5) Torr s (1.3×10^(−3) Pa s) each of the (rather dim and diffuse) overlayer beams has split into two beams. These beams then move toward the substrate beams with increasing CO surface coverage, until near saturation coverage the angle between the split overlayer beams subtended at the (00) beam is greater than 30°.
|Additional Information:||© 1976 by the American Vacuum Society. Received 3 September 1975; in final form 2 October 1975. Research supported via instrumentation grants from both the National Science Foundation (Grant No. GP-37186) and the Research Corporation. Acknowledgment is also made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for the support of this research.|
|Classification Code:||PACS: 82.65.M, 68.20.0, 68.43.-h, 61.05.jh, 68.49.Jk|
|Official Citation:||Abstract: CO chemisorption on Ir(111) C. M. Comrie and W. H. Weinberg J. Vac. Sci. Technol. 13, 264 (1976); http://dx.doi.org/10.1116/1.568864|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||08 Aug 2012 14:58|
|Last Modified:||26 Dec 2012 15:52|
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