Electron spin mapping of coal molecular structure by ENDOR (Electron-Nuclear Double Resonance): Quarterly technical progress report. [Peryline, radical adsorbed or powdered alumina surface]

Technical Report · Fri Apr 15 00:00:00 EDT 1988

OSTI ID:6988092

Belford, R L

In any paramagnetic material the unpaired electrons interact with those neighboring nuclei having non-zero moments. In electron spin echo (ESE) spectroscopy these interactions manifest themselves as modulations in the echo decay envelope, commonly called electron spin echo envelope modulation (ESEEM). The frequencies, intensities, and decays of these modulations give information about the types and number of nuclei as well as the interaction distances for the nuclei. Here we report low-frequency matrix modulations, not attributable to deuterium, in two different disordered systems /endash/a whole coal and perylene radical adsorbed on a powdered alumina surface. We believe these to be the first reports of ESEEM by /sup 13/C in natural abundance and by /sup 27/Al in disordered systems observed by stimulated (3-pulse) echos. 24 refs., 4 figs.

• Research Organization: Illinois Univ., Urbana (USA)
• DOE Contract Number: FG22-84PC70782
• OSTI ID: 6988092
• Report Number(s): DOE/PC/70782-15; ON: DE88013130
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ACOUSTIC ESR
ADSORPTION
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM OXIDES
AROMATICS
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
CONDENSED AROMATICS
DOCUMENT TYPES
ELECTRON SPIN RESONANCE
ENDOR
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MOLECULAR STRUCTURE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERYLENE
POWDERS
PROGRESS REPORT
RADICALS
RESONANCE
SORPTION
SORPTIVE PROPERTIES
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES