Abstract

The hexachlorometallates Cs₂ZrCl₆ and Cs₂HfCl₆, formed by the treatment of CsCl in concentrated HCl with either zirconium or hafnium oxychloride, fluoresce efficiently when excited by x-rays or radiation at 254 nm. The excitation and emission spectra obtained from powder samples of the two compounds are nearly identical. For the Zr complex, the maxima for excitation (narrow band) and the emission (broad band) are at 258 and 451 nm, respectively. The corresponding values for the Hf complex are at 254 and 449 nm. The quantum yields with excitation at 254 nm are near unity. The t_1/2 value for the fluorescence decay is about 10 μsec for both compounds when excited with a 40 nsec pulse from a filtered 110 kVp x-ray source.

© 1984 Optical Society of America