AN ELECTRON SPIN RESONANCE STUDY OF A $gamma$-IRRADIATED SINGLE CRYSTAL OF GLYCOLIC ACID
Measurements were made of the electron spin resonance spectrum of a gamma -irradiated single crystal of glycolic acid as a function of crystal orientation. These confirm that the trapped radicals are carboxy hydroxy methyl radicals, HOCHCOOH. The results are expressed in the form of a spin Hamiltonian which includes a coupling tensor for the hydrogen attached to the central carbon atom and a tensor for the hydroxyl hydrogen. A special feature of the spectra is that the relative intensities of the hyperfine lines are non-integral, and this is explained by a derivation of the transition moments which shows that the usual selection rule DELTA M/sub I/ = 0 is inapplicable to the solid state. The anisotropic g tensor is also evaluated. The tensors are briefly discussed in relation to the orientation of the radicals in the crystal and their electronic structure. (auth)
- Research Organization:
- Univ. of Birmingham, Eng.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-012617
- OSTI ID:
- 4175714
- Journal Information:
- Molecular Physics (England), Journal Name: Molecular Physics (England) Vol. Vol: 3; ISSN MOPHA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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