The Electron Spin Resonance of γ-Irradiated Sodium Polyphosphate. II. Effects of the Degree of Polymerization and the Kind of Cation

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Abstract
Sodium polyphosphate irradiated with γ-rays was investigated with ESR by varying the degree of polymerization and by replacing sodium ion with other cation. By irradiating at room and liquid nitrogen temperatures and observing ESR at various temperatures, nine kinds of paramagnetic centers were detected. Two of them were attributed to trapped electrons and the others to trapped holes. Four among the latter groups were assigned to radicals on polyphosphate; fragments by bond rupture, –O3PO°· and °·PO3–, radical on end group, –O3PO°·, and radical on chain, –O2P\overset·°OO–.