X-band ENDOR and S-band ESEEM of paramagnetic disordered solids

X-band ENDOR and S-band ESEEM have been employed in this study to measure weak electron-nuclear hyperfine and nuclear electric quadrupole couplings in paramagnetic disordered solids. In the X-band ENDOR investigation, radicals generated from perylene adsorbed on catalytically active alumina and silica-alumina surfaces were studied. Complex ENDOR spectra were obtained. The magnitudes of the principal elements of the anisotropic hyperfine matrix for each chemically distinct type of proton could be determined by means of a computer simulation analysis. The hyperfine parameters for radicals on both of the surfaces studied are found to be nearly identical and the radicals are assigned as the perylene cation radical. In addition, matrix ENDOR signals are found to reveal distinct differences between the surface adsorption sites on the two oxides studied. Most notably, a matrix peak attributed to $\sp{27}$Al nuclei is detected from samples prepared with alumina. However, this peak was not detected from samples prepared with the silica-alumina.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemistry

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Crookham, Harry Clark

Contributors dc:contributor

• Belford, R. Linn

• Chemistry, Physical

Statement dc:rights

• Copyright 1990 Crookham, Harry Clark

Language dc:language

eng

Identifier

AAI9114215
(UMI)AAI9114215

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21775