Free ← bound and bound ← bound profiles in excitation spectra of the B31 ← X10+ transition in CdNg (Ng = noble gas) complexes

•Systematic characterization of B31-state interatomic potential in CdNg.•B31-state potentials determined above their dissociation limit in CdNe and CdAr.•Modified ab initio potentials as a representation of B31-state in CdNg.•Rotationally resolved profile of (υ′ = 2, υ″ = 0) band in B31 ← X10+ transition in CdAr.•Revisit of excitation spectra of B31 ← X10+ transition in CdHe and CdXe.

Excitation spectra of CdNe, CdAr and CdKr complexes were recorded using the B31(53P1) ← X10+(51S0) bound ← bound and free ← bound transitions. A simulation of the dissociation continua formed by the free ← bound transitions in CdNe and CdAr permitted a determination of the repulsive part of the B31-state potential above the dissociation limit. The bound ← bound transitions in the excitation spectra of CdNe, CdAr and CdKr, and those previously recorded for CdHe and CdXe, were analyzed; by including their rotational structure and isotopic composition in the analysis, the characterization was improved. Morse functions for CdNg (Ng = noble gas) (also Lennard-Jones (12-6) for CdHe) and ab initio calculated interatomic potentials were tested for the representation of the B31-state potential above and below the dissociation limit. It was also found that previously reported ab initio calculated potentials for CdNe, CdAr, CdKr and CdXe could be modified and used. The B31-state rotational constants could be determined from the simulation of the (υ′; υ″) = (2; 0)-band rotational profile in CdAr.

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