Photodissociation of Ar-HCl is simulated by exact wavepacket calculations. The asymptotic wavepacket is projected out onto the product states corresponding to several excitation energies of Ar-HCl. A high relative efficiency of Ar-Cl formation is found at low and high cluster excitation energies. The re-vibrational state distribution of the Ar-Cl radical formed is reflected in the kinetic-energy distribution of the H fragment. Photolysis of Ar-HCl then appears as an efficient method for preparing Ar-CI radicals, simultaneously probing their final state distribution.