Optical Absorption by Silver Halides

Abstract

The absorption spectra of silver chloride, silver bromide, and silver iodide films evaporated on quartz plates have been measured at room temperature and liquid nitrogen temperature. It has been found that the "exciton peaks," which have been believed to depend very little upon temperature, become sharper and shift toward the shorter wavelength side as the films are cooled down to liquid nitrogen temperature. Attempts are made to combine the present data with some published data to give absorption curves for silver chloride and silver bromide over a large range of absorption spectrum at room and low temperatures.