By means of a time of flight technique, using high temperature surface ionization, we have been able to measure the internal energy of atoms formed in the photodissociation of KI at wavelengths between 265 and 335 nm. At all wavelengths only ground state K(2S 1 2) is formed. Between 265 and 295 nm iodine is solely formed in the excited I(2P 1 2) state, above 305 nm only in the ground state I(2P 3 2). © 1979.