ELDOR detection of ENDOR transitions in irradiated organic crystals

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436824· OSTI ID:6692048

Kispert, L D; Chen, T C.S.; Hill, J R; Clough, S

The electron--electron double resonance (ELDOR) spectra of free radicals in ..gamma..-irradiated 4-methyl-2,6-ditertiarybutylphenol single crystals and a deuterated derivative having all the hydrogen atoms except those of the 4-methyl group replaced by deuterium contain an unusually narrow ELDOR line (p--p=90 kHz) when highly saturating observing conditions, large pump power, and 100 kHz field modulation are used. The narrow ELDOR line corresponds to a flip of a proton spin relative to the sum of the hyperfine and external field. The transition is driven by the two microwave fields acting together and occurs when the difference of two frequencies is equal to the nuclear resonance frequency. It has previously been observed by ENDOR, but the ELDOR measurements have better sensitivity at higher temperatures. This suggests that ELDOR detection of ENDOR transitions may have wide utility in the accurate measurement of hyperfine interaction parameters.

• Research Organization: Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35486
• OSTI ID: 6692048
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 69:5; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
DECOMPOSITION
ELDOR
ELECTROMAGNETIC RADIATION
ENDOR
GAMMA RADIATION
IONIZING RADIATIONS
MAGNETIC RESONANCE
MONOCRYSTALS
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
RESONANCE