MECHANISM OF TERBIUM(III)-ENHANCED LYOLUMINESCENCE OF X-RAY-IRRADIATED SODIUM-CHLORIDE

Dissolution of x-ray irradiated sodium chloride in aqueous solution pr oduces a short-lived dynamic solid/solution interface which is able to raise the hydrated terbium(III) cation to its lowest excited state (D -5(4)) and thus to induce the well-known D-5(4) --> F-7-multiplet peak emissions of terbium(III). This contribution points out that the lowe st excited state D-5(4) of terbium(III) is attained by an intermolecul ar energy transfer from a lowest excited singlet state of a solid/solu tion interface-bound chloride anion which is generated by the recombin ation of a hydrated electron with the solid/solution interface-bound c hlorine atom.