Abstract
X-ray or UV irradiation at room temperature of Rh 3+ doped AgCl emulsion powders leads to the production of three paramagnetic Rh 2+ related centres, labeled R4, R5 and R6. A combined X and Q band electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) study allowed the determination of a nearly complete structural model for these centres. In the X band ENDOR spectra of R4 and R5 interactions of the unpaired electron with nearby protons have been identified, indicating that for these centres Cl − ligands have been exchanged by H 2O or OH −. The R6 centre, identified as a (RhCl 6) 4− complex, has been found to be fundamentally different from the dominant centre in large Rh 2+ doped AgCl single crystals grown from the melt. The results are compared with recent work by other reseachers in the same field.
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