RAIRS OF SMALL HYDROCARBONS ONPd(100)

J. P. Camplin, J. K. Eve and E. M. McCASH
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J. P. Camplin: Department of Chemistry, University of York, Heslington, York, YO1 5DD, UK
J. K. Eve: Department of Chemistry, University of York, Heslington, York, YO1 5DD, UK
E. M. McCASH: Department of Chemistry, University of York, Heslington, York, YO1 5DD, UK

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1371-1374

Abstract: Ethyne was seen to physisorb on thePd(100)surface at temperatures below 210 K and chemisorb at temperatures above. Physisorbed multilayers of propyne were observed above a chemisorbed monolayer in the temperature range of 80–130 K. Both alkynes exhibited chemisorption on the Pd surface with theC≡Cbond parallel to the surface. This led to substantial rehybridisation of theC≡Ccarbon atoms, causing the C–H andC–CH3bonds to tilt well away from the surface plane. Ethene was found to form physisorbed multilayers on thePd(100)surface at temperatures between 28 and 70 K. The RAIR spectra were dominated by crystal field effects and bore a close resemblance to spectra of the crystalline solid. This indicated that thePd(100)surface does not play a dominant role in determining the structure of the phase formed on the surface.

Date: 1997
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DOI: 10.1142/S0218625X97001838

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