Optical absorption spectrum of Cu 2+ doped in NH 4Cl single crystal

Abstract

Single crystals of copper-doped ammonium chloride were grown at room temperature. Spectra in the near infrared at room temperature and in the visible at room and liquid-air temperatures were recorded on a Unicam SP-700 spectrophotometer and Hilger medium quartz spectrograph, respectively. The observed absorption bands have been attributed to an ion of Cu 2+ in tetragonal symmetry with 2B 1 as the ground state. Taking into consideration spin-orbit coupling associated with a tetragonal field, a successful interpretation of all the observed bands has been made. The crystal parameters derived are Dq = −1360 cm −1; Ds = −2000 cm −1; Dt = −140 cm −1 and λ = −830 cm −1.