Abstract

The intensity loss in the REMPI spectrum of the F 1Δ(ν=0) state of HCl was shown to be caused by indirect predissociations. The predissociation hypothesis was verified by a pump-and-probe experiment which revealed that the action spectrum of the Cl photofragment has the same rotational state dependence as the intensity loss in the HCl REMPI spectrum. A deperturbation analysis shows that the intensity loss of the F 1Δ state is caused by L-uncoupling and spin—orbit perturbations by the predissociated C 1Π( v′=2) and b 3Π( v′=3) states.

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