High-lying electronic states of the rubidium dimer—Ab initio predictions and experimental observation of the 51Σu+ and 51Πu states of Rb2 by polarization labelling spectroscopy

摘要: Two-colour polarization labelling experiments have been used to explore the excitation spectrum of rubidium dimer in region 25 500–27 000 cm−1, probing two mutually interacting states, identified from ab initio calculations as 51Σu+ and 51Πu states whose atomic dissociation products are Rb(5s) + Rb(5d). Treating rather irregular progressions observed spectra transitions single with (numerous) local perturbations, we propose spectroscopic parameters potential energy curves describe investigated levels. Observations cover more than 20 vibrational levels inner minima both states. Analysis was guided by performed 1,3Λg,u electronic Rb2 up Rb(5f) asymptote. The theoretical given ASCII format an supplement this paper.