Emission Spectra of S2−, Se2−, and SeS− Ions in KI Crystals

Luminescence emission measurements made at 4.2°K on KI crystals containing the ions S2−, Se2−, and SeS− revealed characteristic banded emission spectra similar to that of O2−, though both emission and excitation occur at longer wavelengths. The SeS− emission was always accompanied by S2− and Se2− emissions, so the emission spectrum was computed from three spectra obtained by excitation wavelengths favoring S2−, SeS−, and Se2− emission, respectively. From the detailed isotopic structure observed in all emission spectra, the ground-state vibration constants ωe″ and ωe″xe″ were calculated, and also values of ν00, the origin of the vibrational band system.