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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 30, 1975 - Issue 2
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Original Articles

ENDOR study of CH2COOH radicals in γ-irradiated single crystals of glycine

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Pages 425-435 | Received 13 Jun 1974, Published online: 23 Aug 2006
 

Abstract

The CH2COOH radicals in γ-irradiated glycine have been observed in two spectroscopically inequivalent forms by the ENDOR method. The first form (A) was induced by warming γ-irradiated crystals at 77 K up to 120–140 K, the second one (A′)—up to 140–300 K.

The proton and nitrogen couplings are given for these two forms. The transition from A to A′ form was observed at 140–160 K. This transition is discussed in terms of a double-minimum potential curve for the hydrogen bond protons.

The second-order effects are reduced to indirect nuclear-nuclear interaction terms giving rise to the splitting of ENDOR lines. The general expression for this interaction has been obtained. The indirect nuclear-nuclear interaction of two α-protons of CH2COOH radicals is examined. The relative signs of proton hyperfine couplings were determined by comparison with experimental data.

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