ESR Studies of an Intrinsic Trapped‐Electron Center in X‐Irradiated Alkali Borate Glasses

Electron spin resonance studies have been carried out at X‐band frequencies on a large number of glasses spanning the lithium, sodium, and potassium borate glass systems, following x irradiation at cryogenic temperatures (T ∼ 25 or ∼ 77°K). A new, intrinsic paramagnetic defect center characterized by a sizeable hyperfine interaction with boron [A (11B) ∼ 100 G] was observed, in addition to the more familiar boron–oxygen hole centers. The new center, which is readily destroyed by visible light or thermal annealing above ∼ 100°K, is shown to be of the trapped‐electron type. By means of computer simulations of the spectra, a reasonably complete set of spin–Hamiltonian parameters is derived in spite of the obscuring effects of a substantial distribution in hyperfine coupling constants. Possible models for the new defect are considered and its potential usefulness as a “probe” of the structure of alkali borate glasses is discussed.

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