The Tl1 + I dissociative state in thallium lodide

Experiments have been performed to determine the fluorescence yield of the 535-nm transition in photodissociated thallium iodide vapor as a function of the excitation wavelength in the range from 182 to 209 nm. The spectral dependence of the fluorescence yield, together with the known structure of the molecular ground state, allowed the calculation of the slope of the Tl¹ + I dissociative potential.