Production of ultracold RbCs molecules in the lowest ground state via the BΠ short-range state.

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ID: 29062
2019
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Abstract
We investigate the production of cold RbCs molecules in the lowest vibronic level of the ground electronic state via the BΠ short-range state. The photoassociation (PA) spectra of the BΠ state, including newly observed transition to 2 vibronic levels, are obtained by high sensitivity time-of-flight mass spectrometry. Based on these PA spectra, the harmonic and anharmonic constants of vibronic states are obtained, resulting in predicted vibronic energies with an uncertainty of 1-2 cm. The BΠ (v = 3) state is found to have the maximum production rate for ground-state molecules with a value of 3(1) × 10 s, which is 3 times larger than the value via the previously studied 2Π (v = 10, J = 0) state with two-photon cascade decay. The populations of J = 0, 1, and 2 rotational levels of XΣ (v = 0) state molecules formed via the BΠ (v = 3, J = 1) state are measured to be around 20%, 40%, and 20%. To quantify the coupling strength between the BΠ (v = 3) state and XΣ (v = 0) state, the transition dipole moment between them is measured to be 7.2(2) × 10ea, which is also 3 times larger than the value between the 2Π (v=10) state and XΣ (v = 0) state, meaning the BΠ (v = 3) state has a stronger coupling with the XΣ (v = 0) state. Our detailed measurements provide relevant parameters for investigation on direct stimulated Raman adiabatic passage transfer between the atomic scattering state and molecular bound state for RbCs molecules.
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Authors Liu, Yuting;Gong, Ting;Ji, Zhonghua;Wang, Gaoren;Zhao, Yanting;Xiao, Liantuan;Jia, Suotang;
Journal The Journal of Chemical Physics
Year 2019
DOI
10.1063/1.5108637
URL
Keywords Keywords not found

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