Abstract

Energy-dependent coupled-channel models are presented for atoms and diatomic molecules which can reproduce entire bound-state (closed-channel) energy level structures and associated electronic transition intensities to within the experimental uncertainties in the high resolution spectroscopic data from which the levels are derived. Discussion includes the effects of energy dependence on the close-coupled μ_α parameters, the properties of the U_iα elements of the frame transformation matrix describing the transformations between close-coupled and loose-coupled representations, and the effects of perturber levels outside the channel structures represented by a specific frame transformation. Examples include precise reproduction (within average experimental uncertainties of <0.2 cm^–1) of the msmp³,mpnd odd-parity bound levels with J ⩽ 3 for the fourth group atoms Si, I, Ge I, and Sn I, and the electronic structures in molecular He₂ associated with the (1σ_g)²(1σ_u)npλ and (1σ_g)²(1σ_u)ns,ndλ configurations.

© 1986 Optical Society of America