The Rb2 31Πg state: Observation and analysis

Abstract

This paper reports observations and analysis of the Rb2 31Πg state. A total of 323 rovibrational term values spanning the range of the rotational quantum number J = 7 through 77 and the vibrational quantum number v = 2 through 23 (about 1/3 of the potential well depth) were measured using the optical–optical double resonance technique. The term values are simulated within a model of a piece-wise multi-parameter potential energy function based on the generalized splines. This function not only enables a reproduction of the experimental data with a reasonable quality but also approximates the available ab initio function in its whole range with a uniform accuracy.

Experimental study of the 61Σg+ state of the rubidium dimer

“…The perturbations are drastically enlarged in the region around 25300 cm −1 indicating resonances of energy levels. This is the same region where the biggest perturbations were observed for the 3 1 Π g state [83]. This fact indicates that these electronic states are coupled with each other and, maybe, with other states in this energy region.…”

“…However, we only mentioned an at-tempt (generally speaking, successful) to use it in the analysis of the ground singlet and triplet states of the Cesium dimer, while the final results were presented in a form of the MLR3 (Morse Long Range-3) function by Coxon and Hajigeorgiou [80]. Later [83] we applied this approach to a combination of experimental and ab initio data on the Rb 2 3 1 Π g state. It allowed us to adequately reproduce the observed ro-vibrational term values and to approximate the ab initio potential energy function with a uniform accuracy in its entire range, including some non-trivial bends.…”

“…More general equations can be found in Refs. [83,86]. Our model potential function has the same form as the one employed in a number of earlier works (see Refs.…”

“…The experimental details have been described previously in Ref. [83]. Briefly, the Rb 2 molecules were generated in a heat pipe oven loaded with Rubidium metal containing 85 Rb and 87 Rb isotopes in the natural abundance ratio.…”