Effect of CO2 laser light on the excited F centre in KBr

The effect of CO2 laser light on the excited F centre in KBr has been investigated at 80K by monitoring the F emission band. Under the action of CO2 laser light on F centres excited with F light a remarkable decrease of the emission intensity was observed, whereas no changes of the peak energy and linewidth were observed. If any new emission band was induced by the CO2 laser light it was not detected within the limits of experimental error. These results are interpreted by considering the non-radiative decay from the higher excited state in the relaxed configuration to the 1s ground state.