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Title Peroxy spin probes as motional probes in polymers and on oxide surfaces
Creator/Author Kevan, L. ; Schlick, S.
Publication Date1986 May 08
OSTI IdentifierOSTI ID: 5817593
Other Number(s)CODEN: JPCHA
Resource TypeJournal Article
Resource RelationJ. Phys. Chem. ; Vol/Issue: 90:10
Research OrgUniv. of Houston, TX
Subject400201 -- Chemical & Physicochemical Properties ;400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987); OXIDES-- DYNAMICS;PEROXY RADICALS-- ELECTRON SPIN RESONANCE;POLYMERS-- DYNAMICS;SURFACES-- DYNAMICS; BLOCH EQUATIONS;EXPERIMENTAL DATA;GYROMAGNETIC RATIO;HYPERFINE STRUCTURE;MAGNETIC RESONANCE;TENSORS
Related SubjectCHALCOGENIDES;DATA;EQUATIONS;INFORMATION;MAGNETIC RESONANCE;MECHANICS;NUMERICAL DATA;OXYGEN COMPOUNDS;RADICALS;RESONANCE
Description/Abstract Electron spin resonance spectra of peroxy radicals, ROO, at low temperatures indicate a rhombic g tensor with g/sub 1/ approx.^2.04, g/sub 2/ approx.^2.008, and g/sub 3/ approx.^2.002.^Spectra change reversibly with temperature and express the g-tensor averaging due to motion.^In the low- and high-temperature limits, spectra are easy to interpret by inspection.^In the intermediate temperature range, however, extra lines appear and the complex spectra can usually only be interpreted by simulation, using a motional model.^Satisfactory calculated spectra can be obtained by the modified Bloch equations for magnetic relaxation with the addition of a kinetic term reflecting the motional model.^Comparison of calculated spectra as a function of the lifetime of the radical in a specific orientation with experimental results as a function of temperature allows determination of the activation energy for the motion.^This approach has been applied to a variety of polymeric systems and to peroxy-type radicals on surfaces.^Chain axis rotation with large jump angles in polymers, C-O bond rotations, as well as helical motions of the polymer chain ends have been identified and characterized.^41 references, 19 figures, 1 table.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 1998-2007
System Entry Date2001 May 13

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