The article presents the analysis of the ArICl(IP,v _IP,n _IP) population and decay at energies lower than the ArICl(E,v _E = 0,n _E) dissociation limit (IP = E0 ⁺, (Formula presented.), β1), v _IP = 0, 1, n _IP are quantum numbers of the van der Waals (vdW) modes). It shows that the ArICl(IP,v _IP,n _IP) lifetimes determined at spectral ranges where the ArICl(E→X, (Formula presented.), and β→A) luminescence takes place, are the same, τ = 20.3 ± 1.0 ns, i.e. strongly mixed complex states are populated in the ArICl(IP,v _IP,n _IP ← A,v _A,n _A) transitions, and principal channel of the complex decay is emission. We have estimated the ArICl(E0 ⁺,v _E = 0) binding energy and studied the ArICl(IP,v _IP,n _IP) population and decay at energies higher than the ArICl(E,v _E = 0,n _E) dissociation limit. Our research shows that the ArICl(IP,v _IP,n _IP) wave functions corresponding to specific n _IP vdW mode depend on the mode, but they are approximately constant in some spectral ranges. The ArICl(IP,v _IP,n _IP) complex decays to free ICl(E0 ⁺,v _E, (Formula presented.) and β1,v _β) molecules. We have determined the probabilities of these decay channels and shown that all the ICl(IP) states are mixed under the action of the Ar atom, i.e. this atom does not behave in the ArICl(IP,v _IP,n _IP) complexes as a ‘spectator’ as it occurs in the RgI ₂(IP) states.