title: Satellite bands of the RbCs molecule in the range of highly excited states.
abstract: We report on the observation of three RbCs satellite bands in the blue and green ranges of the visible spectrum. Absorption measurements are performed using all-sapphire cell filled with a mixture of Rb and Cs. We compare high resolution absorption spectrum of Rb-Cs vapor mixture with pure Rb and Cs vapor spectra from the literature. After detailed analysis, the new satellite bands of RbCs molecule at 418.3 nm, 468.3, and 527.5 nm are identified. The origin of these bands is discussed by direct comparison with difference potentials derived from quantum chemistry calculations of RbCs potential energy curves. These bands originate from the lower Rydberg states of the RbCs molecule. This study thus provides further insight into photoassociation of lower Rydberg molecular states, approximately between Cs(7s) + Rb(5s) and Cs(6s) + Rb(6p) asymptotes, in ultracold gases.
authors.affiliation: Institute of Physics, Bijenička cesta 46, Zagreb 10000, Croatia.
authors.forename: Mario
authors.initials: M
authors.lastname: Rakić
authors.affiliation: Institute of Physics, Bijenička cesta 46, Zagreb 10000, Croatia.
authors.forename: Robert
authors.initials: R
authors.lastname: Beuc
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bât. 505, Campus d'Orsay, Orsay Cedex 91405, France.
authors.forename: Nadia
authors.initials: N
authors.lastname: Bouloufa-Maafa
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bât. 505, Campus d'Orsay, Orsay Cedex 91405, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Dulieu
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bât. 505, Campus d'Orsay, Orsay Cedex 91405, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Vexiau
authors.affiliation: Physics Department, Kuwait University, PO Box 5969, Safat-13060, Kuwait.
authors.forename: Goran
authors.initials: G
authors.lastname: Pichler
authors.affiliation: Institute of Physics, Bijenička cesta 46, Zagreb 10000, Croatia.
authors.forename: Hrvoje
authors.initials: H
authors.lastname: Skenderović