Transition Dipole Moment Measurements of Ultracold Photoassociated ⁸⁵ Rb ¹³³ Cs Molecules by Depletion Spectroscopy

Abstract

The transition dipole moments (TDMs) of ultracold 85Rb133Cs molecules between the lowest vibrational ground level, X1Σ+ (v = 0, J = 1), and the two excited rovibrational levels, 23Π0+ (v′ = 10, J′ = 2) and 21Π1 (v′ = 22, J′ = 2), are measured using depletion spectroscopy. The ground-state 85Rb133Cs molecules are formed from cold mixed component atoms via the 23Π0− (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)×10−3ea0 and 1.6(1)×10−2ea0, respectively, where ea0 represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the 21Π1 (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.

Molecular opacities of low-lying states of oxygen molecule*

“…The oxygen molecule (O 2 ), which plays an important role in the photo-physical, photochemical, and atmospheric spectroscopy, has received considerable attention over several decades. [1][2][3][4][5][6][7] The accurate and detailed information about the electronic states of O 2 , i.e., X 3 Σ − g state and low-lying excited states, the potential energy curves (PECs), and transition properties, which are significant for knowing more about spectrum of many kinds of molecules, [8][9][10] are required to understand the mechanism of the chemical reactions including oxygen molecule [11][12][13][14][15][16][17] and to evaluate the abundance of oxygen element in the universe and atmosphere. [15,18,19] The experimental investigations were performed for the ground state and several low-lying electronic states [20][21][22] several decades ago.…”

Explicitly correlated configuration interaction investigation on low-lying states of SiO + and SiO

“…Previous investigations show that the SOC effects are very important for spectroscopic properties of low-lying states, even when only light atoms are included. [43][44][45][46] By considering the SOC effects, different Λ-S states with common Ω components will be recombined and change the shape of PECs. Figure 3 only shows the PECs of the low-lying 15 Ω states.…”