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

TL;DR

This paper develops a theoretical model to analyze the photoassociation spectra of the $^{85}$Rb$^{133}$Cs molecule in the $(3)^3\Sigma^+$ state, determining key molecular parameters and deriving its potential energy curve.

Contribution

The study provides a detailed theoretical analysis of the $(3)^3\Sigma^+$ state, including vibrational levels, coupling constants, and potential energy curve, advancing understanding of ultracold molecule spectroscopy.

Findings

Determined term energies, spin-spin coupling, and hyperfine constants for nine vibrational levels.

Constructed the potential energy curve using RKR method and compared with ab initio calculations.

Enhanced understanding of the molecular structure relevant for ultracold molecule research.

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.