Electron spin echo envelope modulation studies of natural abundance carbon-13 and aluminum-27 in two disordered systems
Electron spin echo envelope modulation (ESEEM) of stimulated echoes in two different systems--an Illinois No. 6 whole coal and a perylene radical ion adsorbed on alumina powder--reveals matrix interactions from natural abundance low-moment nuclei. Attributing a component of the ESEEM to C-13 in the coal sample and to Al-27 nuclei in the alumina, simulations of the modulations yield values for the hyperfine coupling (a/sub iso/ = 0.4 or 0.01 MHz), the interaction distance (r = 3.05 or 3.3 Angstrom), and the number of interacting nuclei (n approx. = 1). These values, being quite different than those obtained from the simulation of the proton matrix peaks, provide complementary information about the environments of the radicals.
- Research Organization:
- Univ. of Illinois, Urbana (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6478992
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:13; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010600 -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACOUSTIC ESR
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM OXIDES
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COUPLING
DATA
ELECTRON SPIN RESONANCE
ENERGY SOURCES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HYPERFINE STRUCTURE
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
RESONANCE
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS