Complete characterization of the 3p Rydberg complex of a molecular ion: MgAr. II. Global analysis of the AΠ and BΣ (3p) states.

We report a global study of the 3p Rydberg complex of the MgAr molecular ion. High-resolution spectroscopic data on the two spin-orbit components of the A electronic state were obtained by isolated-core multiphoton Rydberg-dissociation spectroscopy up to vibrational levels as high as v' = 29, covering more than 90% of the potential wells. Accurate adiabatic potential-energy functions of the A and B states, which together form the 3p Rydberg complex, were obtained in a global direct-potential-fit analysis of the present data and the extensive data on the B state reported in Paper I [D. Wehrli et al., J. Chem. Phys. 153, 074310 (2020)]. The dissociation energies of the B state, the two spin-orbit components of the A state, and the X state of MgAr are obtained with uncertainties (1 cm) more than two orders of magnitude smaller than in previous studies.