The article presents results of experimental and theoretical
analysis of the T-shaped and linear HeICl van der Waals
complexes in the valence A1 and ion-pair β1 states as well as
the HeICl(A1,vA,nA !X0+,vX=0,nx and β1,vβ,nβ !A1,vA,nA) optical
transitions (ni are quantum numbers of the vdW) modes). The
HeICl(β1,vβ,nβ)!He+ICl(E0+, D02, β1) decay are also studied.
Luminescence spectra of the HeICl(β1,vβ=0–3,nβ) complex
electronic (ICl(E0+,vE, D02; vD0 ) and vibrational ICl(β1,vβ) predissociation
products are measured, and branching ratios of decay
channels are determined. To construct potential energy surfaces
for the HeICl(A1, β1) states, we utilized the intermolecular
diatomic-in-molecule perturbation theory first order method.
Experimental and calculated spectroscopic characteristics of the
A1 and β1 states agree well. Comparison of the experimental
and calculated pump-probe, action and excitation spectra
shows that the calculated spectra describe the experimental
spectra adequately.