Related papers: Hyperfine-resolved optical spectroscopy of ultracold $^{87}$Rb$^{133}$Cs molecules: the $\mathrm{b}^3Π

Hyperfine-resolved optical spectroscopy of ultracold $^{87}$Rb$^{133}$Cs molecules: the $\mathrm{b}^3Π_0$ metastable state

URL: http://arxiv.org/abs/2510.24660v1
Date: Tue, 28 Oct 2025 17:24:07 GMT
Title: Hyperfine-resolved optical spectroscopy of ultracold $^{87}$Rb$^{133}$Cs molecules: the $\mathrm{b}^3Π_0$ metastable state
Authors: Arpita Das, Albert Li Tao, Luke M. Fernley, Fritz von Gierke, Philip D. Gregory, Simon L. Cornish, Jeremy M. Hutson, Romain Vexiau, Olivier Dulieu,
Abstract summary: We perform hyperfine-resolved spectroscopy of transitions from the vibronic ground state to the lowest rovibrational states of the electronic state.<n>These transitions are spin forbidden, resulting in narrow linewidths, and feature near-diagonal Franck-Condon factors.<n>We develop a model of the hyperfine and Zeeman structure that includes coupling between the $0+$ and $0-$ components.
Score: 2.0722018747867867
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Using an ultracold gas of $^{87}$Rb$^{133}$Cs molecules, we perform hyperfine-resolved spectroscopy of transitions from the vibronic ground state to the lowest rovibrational states of the electronic state $\mathrm{b}^3\Pi_0$, as a function of magnetic field. These transitions are spin forbidden, resulting in narrow linewidths, and feature near-diagonal Franck-Condon factors. We develop a model of the hyperfine and Zeeman structure that includes coupling between the $0^+$ and $0^-$ components of $\mathrm{b}^3\Pi_0$. We fit the spectra to obtain rotational and hyperfine coupling constants. We measure transition dipole moments associated with specific transitions by directly observing Rabi oscillations as a function of a resonant laser pulse duration. Using resonant $\pi$ pulses, we prepare molecules in the electronically excited state and directly measure the spontaneous emission rate.

Related papers

Optical pumping simulations and optical Rabi frequency measurements in $^{151}\mathrm{Eu}^{3+}\!:\mathrm{Y}_2\mathrm{SiO}_5$ under magnetic field [28.617171327458585]
In this work, we investigate $151mathrmEu3+!:mathrmYmathrmSiO_5$ under the application of magnetic field.<n>We present a simple numerical simulator for calculating the effect of optical pumping schemes that allow the isolation of a single frequency class of ions.<n>We measure the optical Rabi frequency of 21 transitions among 36 possible optical-hyperfine transitions, allowing for the construction of a 6x6 branching ratio matrix.
arXiv Detail & Related papers (2025-07-07T15:51:04Z)
Broadband electron paramagnetic resonance spectroscopy of $^{167}$Er:$^{7}$LiYF$_4$ at mK temperatures [0.0]
Rare-earth spin ensembles are a promising platform for microwave quantum memory applications.<n>By fitting the spin Hamiltonian to the zero-field spectrum, we obtain refined parameters of the magnetic field-independent interactions.<n>We also study the influence of the quadrupole interaction on the hyperfine splitting in the zero and low magnetic field range.
arXiv Detail & Related papers (2025-01-08T18:11:19Z)
Spectroscopic characterization of singlet-triplet doorway states of aluminum monofluoride [0.0]
We present a hyperfine resolved spectroscopic study of the A$1Pi, v=6$ // b$3Sigma+, v=5$ system in a jet-cooled, pulsed molecular beam. The measured lifetimes range between 2 ns and 200 ns, determined by the degree of singlet-triplet mixing for each level.
arXiv Detail & Related papers (2022-02-16T08:13:35Z)
Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance [58.720142291102135]
We investigate the production of all-optical $39$K Bose-Einstein condensates with different scattering lengths using a Feshbach resonance near $33$ G. We are able to produce fully condensed ensembles with $5.8times104$ atoms within $850$ ms evaporation time at a scattering length of $232. Based on our findings we describe routes towards high-flux sources of ultra-cold potassium for inertial sensing.
arXiv Detail & Related papers (2022-01-12T16:39:32Z)
Spectroscopic characterization of the a$^3\Pi$ state of aluminum monofluoride [0.9485862597874625]
All $Q$ lines of the strong A$1Pi$ $leftarrow$ X$1Sigma+$ transition around 227nm are rotationally closed. The same holds for the narrow, spin-forbidden a$3Pi$ $leftarrow$ X$1Sigma+$ transition around 367 nm.
arXiv Detail & Related papers (2021-12-17T13:09:37Z)
High-resolution 'magic'-field spectroscopy on trapped polyatomic molecules [62.997667081978825]
Rapid progress in cooling and trapping of molecules has enabled first experiments on high resolution spectroscopy of trapped diatomic molecules. Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom.
arXiv Detail & Related papers (2021-10-21T15:46:17Z)
Rovibrational structure of the Ytterbium monohydroxide molecule and the $\mathcal{P}$,$\mathcal{T}$-violation searches [68.8204255655161]
The energy gap between levels of opposite parity, $l$-doubling, is of a great interest. The influence of the bending and stretching modes on the sensitivities to the $mathcalP$,$mathcalT$-violation requires a thorough investigation.
arXiv Detail & Related papers (2021-08-25T20:12:31Z)
Characterization of the lowest excited-state ro-vibrational level of $^{23}$Na$^{87}$Rb [2.0575351445652057]
We investigate the lowest ro-vibrational level of the $b3Pi$ state with high resolution laser spectroscopy. This electronic spin-forbidden $X1Sigma+ leftrightarrow b3Pi$ transition features a nearly diagonal Franck-Condon factor.
arXiv Detail & Related papers (2021-08-02T04:28:53Z)
Magic Conditions for Multiple Rotational States of Bialkali Molecules in Optical Lattices [0.0]
We investigate magic-wavelength trapping of ultracold bialkali molecules in the vicinity of weak optical transitions. We show that a frequency window exists between two nearest neighbor vibrational poles in the dynamic polarizability. We derive a set of analytical criteria that must be fulfilled to ensure the existence of such magic frequency windows.
arXiv Detail & Related papers (2021-01-28T21:46:19Z)
$\mathcal{P}$,$\mathcal{T}$-odd effects for RaOH molecule in the excited vibrational state [77.34726150561087]
Triatomic molecule RaOH combines the advantages of laser-coolability and the spectrum with close opposite-parity doublets. We obtain the rovibrational wave functions of RaOH in the ground electronic state and excited vibrational state using the close-coupled equations derived from the adiabatic Hamiltonian.
arXiv Detail & Related papers (2020-12-15T17:08:33Z)
Electrically tuned hyperfine spectrum in neutral Tb(II)(Cp$^{\rm{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
Both molecular electronic and nuclear spin levels can be used as qubits. In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels. This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
arXiv Detail & Related papers (2020-07-31T01:48:57Z)
Anisotropy-mediated reentrant localization [62.997667081978825]
We consider a 2d dipolar system, $d=2$, with the generalized dipole-dipole interaction $sim r-a$, and the power $a$ controlled experimentally in trapped-ion or Rydberg-atom systems. We show that the spatially homogeneous tilt $beta$ of the dipoles giving rise to the anisotropic dipole exchange leads to the non-trivial reentrant localization beyond the locator expansion.
arXiv Detail & Related papers (2020-01-31T19:00:01Z)

This list is automatically generated from the titles and abstracts of the papers in this site.