1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006
Abstract：The transition dipole moments (TDMs) of ultracold $^{85}$Rb$^{133}$Cs molecules between the lowest vibrational ground level, $X^{1}{\it \Sigma}^{+}$ ($v=0$, $J=1$), and the two excited rovibrational levels, $2^{3}{\it \Pi}_{0^{+}}$ ($v'=10$, $J'=2$) and $2^{1}{\it \Pi}_{1}$ ($v'=22$, $J'=2$), are measured using depletion spectroscopy. The ground-state $^{85}$Rb$^{133}$Cs molecules are formed from cold mixed component atoms via the $2^{3}{\it \Pi}_{0^{-}}$ ($v=11$, $J=0$) short-range level, then detected by time-of-flight mass spectrum. A home-made external-cavity diode laser is used as the depletion laser to couple the ground level and the two excited levels. Based on the depletion spectroscopy, the corresponding TDMs are then derived to be 3.5(2)$\times$$10^{-3}$$ea_{0}$ and 1.6(1)$\times$$10^{-2}$$ea_{0}$, respectively, where $ea_{0}$ represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the $2^{1}{\it \Pi}_{1}$ ($v'=22$, $J'=2$) excited level means that it has stronger coupling with the ground level. It is meaningful to find more levels with much more strong coupling strength by the represented depletion spectroscopy to realize direct stimulated Raman adiabatic passage transfer from scattering atomic states to deeply molecular states.
Debatin M, Takekoshi T, Rameshan R, Reichsllner L, Ferlaino F, Grimm R, Vexiau R, Bouloufa N, Dulieuc O and Ngerla H C 2011 Phys. Chem. Chem. Phys.13 18926
2018, Vol. 35 
