Analyzing the photoassociation spectra of ultracold ${}^{85}$Rb${}^{133}$Cs molecule in $(3{)}^3{\Sigma }^{+}$ state

Abstract

We establish a theoretical model to analyze the photoassociative (PA) spectroscopy of $(3{)}^3{\Sigma }^{+}$ state of ${}^{85}$Rb${}^{133}$Cs molecule. The term energy, spin-spin coupling constants and hyperfine interaction constant of nine vibrational levels in the $(3{)}^3{\Sigma }^{+}$ state are determined. Based on the fitted term energy and rotation constant, the potential energy curve of $(3{)}^3{\Sigma }^{+}$ state is obtained by using the RKR method which is compared with the ab initial potential curve.

9 pages, 2 figures