arXiv:2212.00913 · Physical Review A

Intercombination-line photoassociation spectroscopy of Rb87Yb170

Tobias Franzen, Bastian Pollklesener, Christian Sillus, Axel Görlitz

Published Feb 23, 2023• 5 citations

Abstract

We report on the observation of photoassociation (PA) near the $\text{[Rb]}\phantom{\rule{0.16em}{0ex}}5s\phantom{\rule{0.16em}{0ex}}^{2}S_{\frac{1}{2}}+\text{[Yb]}\phantom{\rule{0.16em}{0ex}}6s\phantom{\rule{0.16em}{0ex}}6p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}$ asymptote in a mixture of $^{87}\mathrm{Rb}$ and $^{170}\mathrm{Yb}$. In a search spanning binding energies between 0.1 and 11 GHz, a single pair of interspecies PA resonances is detected around 3.1 GHz. These resonances are characterized by extracting PA rates, binding energies, and Zeeman shift coefficients. Using one of these resonances, two-photon photoassociation is performed, improving on previous measurements of the binding energies of the two least bound states in the electronic ground state and demonstrating intercombination-line photoassociation as a powerful spectroscopic tool. We discuss implications for pathways towards RbYb molecules in the absolute ground state.

DOI: 10.1103/physreva.107.023114

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arXiv:2212.00913 · Physical Review A

Intercombination-line photoassociation spectroscopy of Rb87Yb170

Tobias Franzen, Bastian Pollklesener, Christian Sillus, Axel Görlitz

Published Feb 23, 2023• 5 citations

arXiv HTML PDF

Abstract

We report on the observation of photoassociation (PA) near the

\text{[Rb]}\phantom{\rule{0.16em}{0ex}}5s\phantom{\rule{0.16em}{0ex}}^{2}S_{\frac{1}{2}}+\text{[Yb]}\phantom{\rule{0.16em}{0ex}}6s\phantom{\rule{0.16em}{0ex}}6p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}

asymptote in a mixture of

^{87}\mathrm{Rb}

and

^{170}\mathrm{Yb}

. In a search spanning binding energies between 0.1 and 11 GHz, a single pair of interspecies PA resonances is detected around 3.1 GHz. These resonances are characterized by extracting PA rates, binding energies, and Zeeman shift coefficients. Using one of these resonances, two-photon photoassociation is performed, improving on previous measurements of the binding energies of the two least bound states in the electronic ground state and demonstrating intercombination-line photoassociation as a powerful spectroscopic tool. We discuss implications for pathways towards RbYb molecules in the absolute ground state.

DOI: 10.1103/physreva.107.023114

Related papers

Photoassociation spectroscopy of ultracold Yb173 atoms near the intercombination line

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Physical Review AAug 3, 201615 citations

We report on the observation of photoassociation (PA) near the

\text{[Rb]}\phantom{\rule{0.16em}{0ex}}5s\phantom{\rule{0.16em}{0ex}}^{2}S_{\frac{1}{2}}+\text{[Yb]}\phantom{\rule{0.16em}{0ex}}6s\phantom{\rule{0.16em}{0ex}}6p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}

asymptote in a mixture of

^{87}\mathrm{Rb}

and

^{170}\mathrm{Yb}

We report on photoassociation (PA) spectroscopy of a degenerate Fermi gas of

^{173}\mathrm{Yb}

atoms near the dissociation limit of the spin-forbidden

^{1}S_{0}

^{3}P_{1}

intercombination transition. An atom-loss spectrum is measured from a trapped sample for a spectral range down to $\ensuremath{-}1$ GHz with respect to the $f=5/2\ensuremath{\rightarrow}{f}^{\ensuremath{'}}=7/2$ atomic resonance. The spectrum shows 80 PA resonances, revealing the high nuclear spin nature of the system. To obtain additional information on the excited molecular states, we investigate the Zeeman effect on the spectrum near a detuning of $\ensuremath{-}0.8$ GHz and examine the quantum numbers of the Zeeman levels using various two-component spin mixture samples. Finally, we measure the atom-loss rate under PA light for several pronounced PA resonances.

^{133}\mathrm{Cs}^{170}\mathrm{Yb}

^{133}\mathrm{Cs}^{173}\mathrm{Yb}

, and

^{133}\mathrm{Cs}^{174}\mathrm{Yb}

, in each case determining the energy of several vibrational levels including the least-bound state. We fit an interaction potential based on electronic structure calculations to the binding energies for all three isotopologs and find that the ground-state potential supports 77 vibrational levels. We use the fitted potential to predict the interspecies

s

-wave scattering lengths for all seven Cs+Yb isotopic mixtures.

We report on the photoassociation (PA) spectroscopy of cold

^{171}\mathrm{Yb}

atoms in a one-dimensional optical lattice. The PA spectral lines correlating to the

^{1}S_{0}+^{3}P_{1}

(f=1/2)

state are observed experimentally. High accuracy and narrow atom-loss spectra are measured ranging up to about 1.2 GHz red detuning with respect to the atomic resonance. The main systematic frequency shifts of the PA transitions are determined with total uncertainties less than 100 kHz, which is more accurate than previous similar experimental results. We determine the initial scattering state of the PA spectra by comparing the spectra with polarized and unpolarized atomic samples. By comparatively analyzing theoretical results calculated based on an adiabatic molecular potential with experimental data, the excited molecular potentials corresponding to the spectral lines are clarified. The precision measurement of the narrow PA spectra plays an important role in exploring atomic interactions and lays the groundwork for the study of cold ytterbium molecules.

{}^{170}

{}^{174}

Yb and

{}^{174}

{}^{176}

Yb molecules. We develop a single-channel mass-scaled interaction model for the excited state molecule which well reproduces the measured bound state energies. This is an important step toward optical control of interactions in mixtures of ultracold ytterbium gases using heteronuclear optical Feshbach resonances. The model developed is applicable in collisions of other similar systems, such as cadmium and mercury.

We report on the creation of ultracold heteronuclear and electronically excited Rb*Yb molecules in a hybrid conservative trap by photoassociation of ultracold

^{87}\mathrm{Rb}

and

^{176}\mathrm{Yb}

. The molecules are formed below the

{\mathrm{Rb}}_{5\mathit{p}1}(^{2}P_{1/2})+{\mathrm{Yb}}_{6\mathit{s}2}(^{1}S_{0})

dissociation limit and the resonances are detected using trap-loss spectroscopy. By addressing vibrational levels with binding energies down to ${E}_{B}=\ensuremath{-}h\ifmmode\times\else\texttimes\fi{}2.2\phantom{\rule{0.16em}{0ex}}\mathrm{THz}$, we study the change in hyperfine coupling of the diatomic molecule as a function of internuclear separation. We observe a decreasing hyperfine splitting for more tightly bound excited molecular states where the hyperfine splitting is reduced by more than

30%

compared to the atomic value for

^{87}\mathrm{Rb}