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Asian Spectroscopy Conference (ASC)

LiK B1Π potential: combining short and long-range data

Sofia Botsi, Anbang Yang, Sunil Kumar, Pal S. B., Lam M., Kai Dieckmann

Published Oct 27, 2020• 0 citations
Publisher

Abstract

We present spectroscopic measurements of the long range states of the 6 Li 40 K molecule near its Li(4 2 S1/2) + K(4 2 P3/2) asymptote which in combination with existing data in the short range lead to the full characterization of the B 1 Π potential with high spectroscopic resolution.This survey was conducted in the context of identifying a suitable pathway for the efficient two-photon transfer to the absolute ro-vibronic ground state of 6 Li 40 K heteronuclear dimers.

DOI
10.32655/asc_8-10_dec2020.49

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We present spectroscopic measurements of the long range states of the 6 Li 40 K molecule near its Li(4 2 S1/2) + K(4 2 P3/2) asymptote which in combination with existing data in the short range lead to the full characterization of the B 1 Π potential with high spectroscopic resolution.This survey was conducted in the context of identifying a suitable pathway for the efficient two-photon transfer to the absolute ro-vibronic ground state of 6 Li 40 K heteronuclear dimers.
We present an accurate potential energy curve of the B (1)Pi state in the LiCs molecule for which vibrational levels between v(') = 0 and v(') = 35 (bound by 11.4 GHz) were measured by photoassociation spectroscopy in an ultracold ensemble of (7)Li and (133)Cs atoms. By the combination of conventional spectroscopic data of the B-X system and the new photoassociation measurements a very precise value of the dissociation energy of the ground state X (1)Sigma(+) of LiCs was determined to be D(0) = 5783.495(5) cm(-1).
Abstract Heteronuclear lithium-containing alkali dimers in their ground triplet state offer both electric and magnetic dipole moments, which arise from their unpaired electron distributions and make them suitable for exploring many-body quantum phenomena. Currently, no simple yet accurate analytical form exists to model the triplet interaction potentials of heavier Li-alkali pairs such as LiK, LiRb and LiCs. The Sheng-Tang–Toennies(STT) potential, containing merely two fitting parameters, has earlier successfully reproduced the lowest triplet potential curve of Li 2 and LiNa. In this work, we extend its application to predict the a 3 Σ + state interactions for the three dimers LiK, LiRb, and LiCs. The derived analytical potentials agree closely with high-level a b i n i t i o benchmarks and existing spectroscopic measurements over the complete range of internuclear separations. Our findings verify the robustness and portability of the STT model for representing triplet state potentials across heteronuclear alkali dimers that include lithium.
We investigate the production of cold 85Rb133Cs molecules in the lowest vibronic level of the ground electronic state via the B1Π1 short-range state. The photoassociation (PA) spectra of the B1Π1 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−1. The B1Π1 (v = 3) state is found to have the maximum production rate for ground-state molecules with a value of 3(1) × 104 s−1, which is 3 times larger than the value via the previously studied 23Π0+ (v = 10, J = 0) state with two-photon cascade decay. The populations of J = 0, 1, and 2 rotational levels of X1Σ+ (v = 0) state molecules formed via the B1Π1 (v = 3, J = 1) state are measured to be around 20%, 40%, and 20%. To quantify the coupling strength between the B1Π1 (v = 3) state and X1Σ+ (v = 0) state, the transition dipole moment between them is measured to be 7.2(2) × 10−3ea0, which is also 3 times larger than the value between the 23Π0+(v=10) state and X1Σ+ (v = 0) state, meaning the B1Π1 (v = 3) state has a stronger coupling with the X1Σ+ (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 85Rb133Cs molecules.