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Slichter, C.P. Ansermet, Jean-Philippe 2011-06-06T14:54:19Z 2011-06-06T14:54:19Z 10000-01-01 1985 The author has applied magnetic resonance to study the chemisorption of CO on supported platinum particles. The particles are 10 to 50 Ansgtrom in diameter, supported on alumina. CO is 90% enriched with 13CO. NMR data were taken from 4 K to 600 K. He shows that a measurement of transverse relaxation at 77 K can be used to measure relative distances among molecules in the adsorbed layer. His measurements of transverse relaxation and of spin-lattice relaxation are consistent with the geometry of CO layers chemisorbed on single crystal surfaces. He has observed the narrowing of the NMR line and the effects of motion on transverse relaxation from 300 K to 600 K from which he deduces diffusion energies of 13 and 16 plus/minus 2 kcal/mol, in agreement with measurements of R. Lewis and R. Gomer of the diffusion of CO on Pt tips by Field Emission Microscopy. He demonstrates that conduction electrons are present on CO and shows that the distribution of spin-lattice relaxation times observed at 77 K reflects the various binding configurations present at the surface of each particle, irrespective of the particle size. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T14:54:19Z No. of bitstreams: 1 1985_ansermet.pdf: 4465740 bytes, checksum: 08fcde55dce311babb3c03468562dcfa (MD5) Made available in DSpace on 2011-06-06T14:54:19Z (GMT). No. of bitstreams: 1 1985_ansermet.pdf: 4465740 bytes, checksum: 08fcde55dce311babb3c03468562dcfa (MD5) Previous issue date: 1985 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T14:54:19Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:12:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 862800 http://hdl.handle.net/2142/25283 en 1985 Jean-Philippe Ansermet surface phenomena diffusion rates intermolecular distances electronic properties CO chemisorbed supported platinum catalysts Nuclear magnetic resonance (NMR) transverse relaxation A new approach to the study of surface phenomena, measurements of diffusion rates, intermolecular distances and electronic properties of CO chemisorbed on supported platinum catalysts by nuclear magnetic resonance Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.