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Slichter, C.P. Makowka, Claus Dieter 2011-06-16T14:22:02Z 2011-06-16T14:22:02Z 10000-01-01 1982 Spin Echo Double Resonance (SEDOR) is observed at 77 K for small Pt particles on which l3CO was chemisorbed. The samples are Pt supported on eta-alumina with Pt dispersions (fraction of the atoms that are on the surface) of 26% and 76%. After cleaning, the samples are exposed to CO enriched to 90% l3C• The l3C NMR is observed indirectly through its effect on the 195Pt spin echo. SEDOR allows the NMR of the surface Pt nuclei to be observed underneath the resonance of the nonsurface nuclei from which the surface nuclei are ordinarily unresolved. The position (1.096 kG/MHz) and width (500 G at 80 kG) of the 195pt SEDOR signal confirms the assignment by Rhodes et al. of a peak in the 195pt NMR line shapes to the surface layer of platinum atoms. No surface nuclei are detected at any other locations in the 195pt NMR line shape. Though the 195pt NMR line shapes for the two dispersions are very different, the SEDOR line shapes are identical. SEDOR shows that the bonding of the CO is to the clean Pt surface through the carbon and that the Pt-C J coupling is similar to that in Pt carbonyls. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-16T14:22:02Z No. of bitstreams: 1 1982_makowka.pdf: 4382523 bytes, checksum: 74e703bc387a0ce8638d934aa4690259 (MD5) Made available in DSpace on 2011-06-16T14:22:02Z (GMT). No. of bitstreams: 1 1982_makowka.pdf: 4382523 bytes, checksum: 74e703bc387a0ce8638d934aa4690259 (MD5) Previous issue date: 1982 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-16T14:22:03Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 89406 http://hdl.handle.net/2142/25418 en 1982 Claus Dieter Makowka heterogeneous catalyst double resonance carbon monoxide chemisorbed on highly dispersed platinum spin echo double resonance (SEDOR) Probing the surface of a heterogeneous catalyst: Double resonance of carbon monoxide chemisorbed on highly dispersed platinum Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.