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Title:Nuclear magnetic resonance study of the bonding of carbon monoxide to palladium and platinum surfaces
Author(s):Shore, Susan Eileen
Doctoral Committee Chair(s):Slichter, C.P.
Department / Program:Physics
Subject(s):Nuclear magnetic resonance (NMR)
carbon monozide
palladium sufaces
platinum surfaces
Abstract:The 13c and 17o NMR of CO chemisorbed on small particles of Pd and Pt has been observed. The 17o resonance represents the first reported NMR observation of a spin larger than 1/2 adsorbed on a metal surface. At low temperatures, the 13c resonance of CO on Pd is centered at 540 ppm down field from the 13 C resonance of tetramethylsilane (TMS). The line position is interpreted as the sum of a chemical shift of 230 ppm, typical of CO in transition metal carbonyls, and a Knight shift of 310 ppm. The 13c lineshape and spin lattice relaxation time T1 were measured from 77 K to 400 K. The temperature dependence of the T1 is used to confirm the existence of a Knight shift. From the motional narrowing of the NMR line a diffusion energy of 6+2 kcal/mol for CO on the Pd surface is deduced. A C-0 boo:i length of 1.20+.03 A for CO chemisorbed on Pd was measured using a spin echo double resonance (SEOOR) experiment observing the 170 NMR.
Issue Date:1986
Genre:Dissertation / Thesis
Rights Information:1986 Susan Eileen Shore
Date Available in IDEALS:2011-06-02
Identifier in Online Catalog:994637

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