Luminescence of CuCl Crystal and Its Correlation to the Exciton-II

抄録

Absorption, reflection and luminescence spectra of CuCl crystals and films have been photographed. In addition to the intrinsic absorption of the n=1 and n′=1 exciton bands due to the spin orbit splitting, two weak and sharp absorption lines have been found on the longer wavelength tail of the n=1 exciton band. The n=1 resonance emission has a shift of 5.5 Å to the lower energy side from the corresponding absorption peak. The n=1 Stokes emission, measured at 3901 Å in the previous report, has been found at 4°K to consist of an intense sharp line at 3898.4 Å, a little diffuse line at 3890.6 Å and a satellite band of about 10 Å width, which is ascribed to the acoustic phonon emission. The intense and diffuse lines have the exact coincidence with the two sharp absorption lines which may be due to the transitions involving bound excitons.