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Bulletin of the American Physical Society

The determination of potential energy curve and dipole moment of the (5)0$^{\mathrm{+}}$ electronic state of $^{\mathrm{85}}$Rb$^{\mathrm{133}}$Cs molecule by high resolution photoassociation spectroscopy

Jinpeng Yuan, Yanting Zhao, Zhonghua Ji, Zhonghao Li, Jin‐Tae Kim, Liantuan Xiao, Suotang Jia

Published May 26, 2016• 0 citations
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The determination of potential energy curve and dipole moment of the (5)0+^{\mathrm{+}}+ electronic state of 85^{\mathrm{85}}85Rb133^{\mathrm{133}}133Cs molecule by high resolution photoassociation spectroscopy
We present the formation of ultracold (85)Rb(133)Cs molecules in the (5)0(+) electronic state by photoassociation and their detection via resonance-enhanced two-photon ionization. Up to v = 47 vibrational levels including the lowest v = 0 vibrational and lowest J = 0 levels are identified with rotationally resolved high resolution photoassociation spectra. Precise Dunham coefficients are determined for the (5)0(+) state with high accuracy, then the Rydberg-Klein-Rees potential energy curve is derived. The electric dipole moments with respect to the vibrational numbers of the (5)0(+) electronic state of (85)Rb(133)Cs molecule are also measured in the range between 1.9 and 4.8 D. These comprehensive studies on previously unobserved rovibrational levels of the (5)0(+) state are helpful to understand the molecular structure and discover suitable transition pathways for transferring ultracold atoms to deeply bound rovibrational levels of the electronic ground state.
Photoassociation of 85^{85}85Rb Atoms in 0u+0_{u}^{+}0u+​ States Near the 5S+5P Atomic Limits
We present high resolution photoassociation spectroscopy of RbCs molecules in (2)0(+) long-range state below the Rb(5S1/2) + Cs(6P1/2) asymptote and derive the corresponding C6 coefficient, which is used to revise the potential energy curves. The excited state molecules are produced in a dual-species dark spontaneous force optical trap and detected by ionizing ground state molecules after spontaneous decay, using a high sensitive time-of-flight mass spectrum. With the help of resonance-enhanced two-photon ionization technique, we obtain considerable high resolution photoassociation spectrum with rovibrational states, some of which have never been observed before. By applying the LeRoy-Bernstein method, we assign the vibrational quantum numbers and deduce C6 coefficient, which agrees with the theoretical value of A(1)Σ(+) state correlated to Rb(5S1/2) + Cs(6P1/2) asymptote. The obtained C6 coefficient is used to revise the long-range potential energy curve for (2)0(+) state, which possesses unique A - b mixing characteristic and can be a good candidate for the production of absolutely ground state molecule.
Analyzing the photoassociation spectra of ultracold 85^{85}85Rb133^{133}133Cs molecule in (3)3Σ+(3)^3Σ^+(3)3Σ+ state
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