Mixing of ${0}^{+}$ and ${0}^{-}$ observed in the hyperfine and Zeeman structure of ultracold ${\mathrm{Rb}}_{2}$ molecules

Deiß, Markus; Drews, B.; Denschlag, Johannes Hecker; Tiemann, E.

doi:10.1088/1367-2630/17/8/083032

Cited by 12 publications

(16 citation statements)

References 40 publications

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“…The linewidth of the photoassociation dip is 15 MHz, close to the natural linewidth of about 10 MHz. The next photoassociation line is expected 570 GHz away (29).…”

mentioning

confidence: 91%

State-to-state chemistry for three-body recombination in an ultracold rubidium gas

Wolf

Deiß

Krükow

et al. 2017

Science

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Experimental investigation of chemical reactions with full quantum state resolution for all reactants and products has been a long-term challenge. Here we prepare an ultracold few-body quantum state of reactants and demonstrate state-to-state chemistry for the recombination of three spin-polarized ultracold rubidium (Rb) atoms to form a weakly bound Rb molecule. The measured product distribution covers about 90% of the final products, and we are able to discriminate between product states with a level splitting as small as 20 megahertz multiplied by Planck's constant. Furthermore, we formulate propensity rules for the distribution of products, and we develop a theoretical model that predicts many of our experimental observations. The scheme can readily be adapted to other species and opens a door to detailed investigations of inelastic or reactive processes.

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“…The linewidth of the photoassociation dip is 15 MHz, close to the natural linewidth of about 10 MHz. The next photoassociation line is expected 570 GHz away (29).…”

mentioning

confidence: 91%

State-to-state chemistry for three-body recombination in an ultracold rubidium gas

Wolf

Deiß

Krükow

et al. 2017

Science

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“…In 87 Rb 2 [21] it has been shown that the coupling between Ω = 0 + and Ω = 0 − states can induce an unusually large hyperfine structure of several hundreds of MHz. Thus we examined the possibility for a similar pattern in NaRb.…”

Section: Hyperfine Structure Of the Excited Levelsmentioning

confidence: 99%

High-resolution molecular spectroscopy for producing ultracold absolute-ground-state Na23Rb87 molecules

et al. 2017

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We report a detailed molecular spectroscopy study on the lowest excited electronic states of 23 Na 87 Rb for producing ultracold 23 Na 87 Rb molecules in the electronic, rovibrational and hyperfine ground state. Starting from weakly-bound Feshbach molecules, a series of vibrational levels of the A 1 Σ + − b 3 Π coupled excited states were investigated. After resolving, modeling and interpreting the hyperfine structure of several lines, we successfully identified a long-lived level resulting from the accidental hyperfine coupling between the 0 + and 0 − components of the b 3 Π state, satisfying all the requirements for the population transfer toward the lowest rovibrational level of the X 1 Σ + state. Using two-photon spectroscopy, its binding energy was measured to be 4977.308(3) cm −1 , the most precise value to date. We calibrated all the transition strengths carefully and also demonstrated Raman transfer of Feshbach molecules to the absolute ground state.with w Na a linear combination of the three magnetic dipole coupling constants (The same derivation holds for the operators acting on the Rb nucleus. b. Zeeman operatorMatrix element of the Zeeman effect with the laboratory z-axis defined as the magnetic field axis

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“…The molecules are irradiated for a duration of a few milliseconds by a cw grating-stabilized diode laser which resonantly excites them to c 3 Σ + g levels, leading to molecular loss. We measure the remaining number of molecules by first dissociating them into ultracold atom pairs and then measuring the corresponding atom number via absorption imaging (for details see [19,23]). By scanning the laser frequency from shot to shot, a resonance spectrum is recorded [see Fig.2b) to d)].…”

Section: B Photoexcitation Spectroscopymentioning

confidence: 99%

Level structure of deeply bound levels of the c3Σg+ state of Rb2

et al. 2017

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We spectroscopically investigate the hyperfine, rotational and Zeeman structure of the vibrational levels v = 0, 7, 13 within the electronically excited c 3 Σ + g state of 87 Rb 2 for magnetic fields of up to 1000 G. As spectroscopic methods we use short-range photoassociation of ultracold Rb atoms as well as photoexcitation of ultracold molecules which have been previously prepared in several well-defined quantum states of the a 3 Σ + u potential. As a byproduct, we present optical two-photon transfer of weakly bound Feshbach molecules into a 3 Σ + u , v = 0 levels featuring different nuclear spin quantum numbers. A simple model reproduces well the molecular level structures of the c 3 Σ + g vibrational states and provides a consistent assignment of the measured resonance lines. Furthermore, the model can be used to predict the relative transition strengths of the lines. From fits to the data we extract for each vibrational level the rotational constant, the effective spin-spin interaction constant, as well as the Fermi contact parameter and (for the first time) the anisotropic hyperfine constant. In an alternative approach, we perform coupled-channel calculations where we fit the relevant potential energy curves, spin-orbit interactions and hyperfine functions. The calculations reproduce the measured hyperfine level term frequencies with an average uncertainty of ±9 MHz, similar as for the simple model. From these fits we obtain a section of the potential energy curve for the c 3 Σ + g state which can be used for predicting the level structure for the vibrational manifold v = 0 to 13 of this electronic state.

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Mixing of ${0}^{+}$ and ${0}^{-}$ observed in the hyperfine and Zeeman structure of ultracold ${\mathrm{Rb}}_{2}$ molecules

Cited by 12 publications

References 40 publications

State-to-state chemistry for three-body recombination in an ultracold rubidium gas

State-to-state chemistry for three-body recombination in an ultracold rubidium gas

High-resolution molecular spectroscopy for producing ultracold absolute-ground-state Na23Rb87 molecules

Level structure of deeply bound levels of the c3Σg+ state of Rb2

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