A photoelectric microscope photometer was built for the investigation of the absorption, emission and reflection of single microcrystals. It consists of a Zeiss microscope, a mercury lamp and a multiplier phototube. The transmission of single microcrystals was examined. Evaluating the experimental data neither a plane-parallel, nor a spherical crystal model furnished reliable values for the absorption coefficient. The application of an empirical model based on the non-absorbed radiation made possible the determination of the 3650 Å ultraviolet absorption coefficient. The absorption coefficients of some ZnS-type materials were determined. The 3650 Å ultraviolet absorption coefficients have the following values: hex. ZnS-Ag 124; cub. ZnS-Ag 139; hex. ZnS-Cu 220; hex. ZnS 57,3; ZnS-10CdS-Cu 292; 50ZnS-50CdS-Ag 636/cm. The light emission of microcrystals is increasing with the second power of the diameter. It depends on the light path of ultraviolet radiation within the crystals. The ultraviolet absorption coefficient may be determined from the dependence of the emission on the particle size. The refractive index of microcrystals can be determined from microscopic reflection measurements.
ASJC Scopus subject areas
- Nuclear and High Energy Physics