Abstract
A single crystal of Sr(NO3)2 was irradiated with X-rays at room temperature, and ESR measurements were performed over the temperature range from 85 K to room temperature. It was concluded that besides O- 2, O- 3 and NO2 centers, an F-center was produced, in which an electron was trapped by an NO- 3 vacancy. The orientation of the F-center in the Sr(NO3)2 crystal was determined from the symmetry axis of the g tensor. The sites and orientations of the O- 2,O- 3 and NO2 centers were also determined. The superhyperfine interactions of the F-center with surrounding 14N nuclei of NO- 3 were investigated, and the superhyperfine splitting constants were determined.