The lowest-lying Rydberg state of CdAr van der Waals complex: The improved characterization of the interatomic potential

Previous characterization of the double-well E(6³S₁) - Rydberg state outer potential well (E_out) in CdAr van der Waals (vdW) complex has been based on detection of the E← B(5³P₁) (υ″ = 0–2) transitions only. In this study, the gap in the limited characterization of the E_out shallow well and the neighbouring potential barrier has been filled by recording bound (υ′) ← bound (υ″ = 1–4) and free ← bound (υ″ = 0–4) excitation spectra. The result, spectroscopic description of the E_out well along with the potential barrier have been concluded from simulations of the recorded spectra. The results were compared with those published previously.