Potential energy curves for the B11u state and short-range part of the X10+g state of Cd2 determined from excitation and dispersed fluorescence spectra recorded using the B11u ↔ X10+g transition

Abstract

Laser-induced fluorescence excitation and dispersed fluorescence spectra of a cadmium dimer recorded using the B11u ↔ X10+g transition are reported. In the excitation, well-resolved isotopic structure of several υ′ ← υ″ = 0 vibrational components (υ′ from 34 to 40) as well as a free ← bound unstructured band was recorded. The B11u-state interatomic potential was derived using the ‘inverse-perturbation’ fitting method. In the dispersed fluorescence after selective excitation of the B-state υ′ = 39 level of the 226Cd2 molecular isotopic component, a Condon internal diffraction pattern was recorded and simulated, confirming the υ′-assignment. Analysis of the dispersed fluorescence spectrum yielded information on the repulsive branch of the ground-state potential. The experimental results were compared with results of ab initio calculations as well as with experimental results of earlier studies.