Electron nuclear double resonance study of photostimulated luminescence active centers in CsBr:Eu2+medical imaging plates

Abstract

${\text{CsBr:Eu}}^{2+}$ needle image plates exhibit an electron-paramagnetic-resonance (EPR) spectrum at room temperature (RT), whose intensity is correlated with the photostimulated luminescence sensitivity of the plate. This EPR spectrum shows a strong temperature dependence: At RT it is owing to a single ${\text{Eu}}^{2+}$ ($S$ $=7/2$) center with axial symmetry, whereas at $Tl35$ K the spectra can only be explained when two distinct centers are assumed to be present, a minority axial center and a majority center with nearly extremely rhombic symmetry. In this paper these low-temperature centers are studied with electron nuclear double resonance (ENDOR) spectroscopy, which reveals the presence of $^{1}\mathrm{H}$ nuclei close to the central ${\text{Eu}}^{2+}$ ions in the centers. Analysis of the angular dependence of the ENDOR spectra allows to propose models for these centers, providing an explanation for the observed difference in intensity between the spectral components and for their temperature dependence.