ESR--ENDOR study of l-asparagine xH/sub 2/O single crystals x-irradiated at 77 K
ESR and ENDOR spectroscopy were used to determine the effects of irradiation on single crystals of l-asparagine and partially deuterated l-asparagine x-irradiated at 77 K. Hyperfine tensors were determined from the ENDOR data for two anion radicals, one at the carboxyl end of the molecule and the other at the amide end, and one cation radical, the decarboxylation radical. The ESR spectra of the carboxyl anion radical are the most intense. In addition to several hydrogen ENDOR lines, ENDOR lines for one nitrogen and two deuterium lines were observed, and tensors were determined for the nitrogen and one of the deuterium nuclei in addition to the hydrogen hyperfine tensors. These nitrogen and deuterium couplings were necessary in order to explain the ESR spectra of the decarboxylation radical. None of these radicals were stable when the crystal was warmed to room temperature.
- Research Organization:
- Department of Physics, Florida State University, Tallahassee, Florida 32306
- OSTI ID:
- 6898574
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:10; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
AMIDES
AMINO ACIDS
ASPARAGINE
CARBOXYLIC ACIDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
DECARBOXYLATION
DECOMPOSITION
ELECTRON SPIN RESONANCE
ENDOR
LOW TEMPERATURE
MAGNETIC RESONANCE
MONOCRYSTALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RESONANCE