Extensive high-resolution photoassociation spectra and perturbation analysis of 2(0‒) long-range state of ultracold RbCs molecules
Liu, Jinjun
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https://hdl.handle.net/2142/104505
Description
Title
Extensive high-resolution photoassociation spectra and perturbation analysis of 2(0‒) long-range state of ultracold RbCs molecules
Author(s)
Liu, Jinjun
Contributor(s)
Li, Chuanliang
Zhao, Yanting
Ji, Zhonghua
Su, Dianqiang
Issue Date
2019-06-18
Keyword(s)
Fundamental interest
Abstract
We report high-resolution photoassociation (PA) spectra of RbCs in the $2(0^-)$ long-range state.
Transitions to more than fifty vibrational levels were recorded with the largest binding energy being
507.5 cm$^{-1}$. By fitting the experimental transition frequencies to the improved LeRoy-Bernstein
formula, the $C_6$ coefficient for the potential energy curve of the $2(0^-)$ state was determined to
be -1509$\pm$97 a.u.. Perturbation-induced energy level shift and state mixing of the long-range
$2(0^-)$ and $3(1)$ states have been analyzed using an effective Hamiltonian that may be applied to
mixing between other excited states of RbCs, as well as other heteronuclear diatomic molecules.
Experimentally observed PA transitions to the $v = 190$ vibrational level of the $2(0^-)$ state and a
vibrational perturbing level in the $3(1)$ state have been fit using the effective Hamiltonian, which
provides the accurate value of the perturbation coefficient $\beta_0$. The experimentally determined
rovibronic structure and the deperturbation analysis provide critical information for the search of
new schemes for efficient production of ultracold RbCs molecules in the ground state.
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