Experimental and Theoretical Studies of the HeICl Van der Waals Complexes in the Valence and Ion‐pair States

Abstract

AbstractThe 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+, , β1) decay are also studied. Luminescence spectra of the HeICl(β1,vβ=0–3,nβ) complex electronic (ICl(E0+,vE, ) 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.