A cryofuge for cold-collision experiments with slow polar molecules

Wu, Xing; Gantner, Thomas; Koller, Manuel; Zeppenfeld, Martin; Chervenkov, Sotir; Rempe, Gerhard

doi:10.1126/science.aan3029

Cited by 77 publications

(63 citation statements)

References 50 publications

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“…Ultracold molecular samples produced this way typically have * truppe@fhi-berlin.mpg.de † meijer@fhi-berlin.mpg.de a density many orders of magnitude lower compared to the association methods [44]. New methods are steadily being developed to deliver more molecules at low speeds to the trapping region [45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

et al. 2019

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Here we report on spectroscopic measurements of the aluminum monofluoride molecule (AlF) that are relevant to laser cooling and trapping experiments. We measure the detailed energy level structure of AlF in the X 1 Σ + electronic ground state, in the A 1 Π state, and in the metastable a 3 Π state. We determine the rotational, vibrational and electronic branching ratios from the A 1 Π state. We also study how the rotational levels split and shift in external electric and magnetic fields. We find that AlF is an excellent candidate for laser cooling on any Q-line of the A 1 Π -X 1 Σ + transition and for trapping at high densities.The energy levels in the X 1 Σ + , v = 0 state and within each Ω-manifold in the a 3 Π, v = 0 state are determined with a relative accuracy of a few kHz, using laser-radio-frequency multiple resonance and ionization detection schemes in a jet-cooled, pulsed molecular beam. To determine the hyperfine and Λ-doubling parameters we measure transitions throughout the 0.1 MHz -66 GHz range, between rotational levels in the X 1 Σ + , v = 0 state and between rotational and Λ-doublet levels in all three spin-orbit manifolds of the a 3 Π, v = 0 state. We measure the hyperfine splitting in the A 1 Π state using continuous wave (CW) laser-induced fluorescence spectroscopy of the A 1 Π, v = 0 ← X 1 Σ + , v = 0 band. The resolution is limited by the short radiative lifetime of the A 1 Π, v = 0 state, which we experimentally determine to be 1.90 ± 0.03 ns. The hyperfine mixing of the lowest rotational levels in the A 1 Π state causes a small loss from the the main laser cooling transition of 10 −5 . The off-diagonal vibrational branching from the A 1 Π, v = 0 state is measured to be (5.60 ± 0.02) × 10 −3 in good agreement with theoretical predictions. The strength of the spin-forbidden A 1 Π, v = 0 → a 3 Π, v = 0 transition is measured to be seven orders of magnitude lower than the strength of the A 1 Π, v = 0 → X 1 Σ + , v = 0 transition. We determine the electric dipole moments µ(X) = 1.515 ± 0.004 Debye, µ(a) = 1.780 ± 0.003 Debye and µ(A) = 1.45 ± 0.02 Debye in X 1 Σ + , v = 0, a 3 Π, v = 0 and A 1 Π, v = 0, respectively, by recording CW laser excitation spectra in electric fields up to 150 kV/cm.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

et al. 2019

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“…Ammonia (NH 3 ) 14 and methyl radical (CH 3 ) 15 were cooled down to low (< 1 K) temperatures with Stark and Zeeman decelerators and subsequently trapped in electric and magnetic traps, respectively. Cold fluoromethane (CH 3 F) was produced using centrifuge decelerator 16 . Fluoromethane (CH 3 F) 17 , formaldehyde (H 2 CO) 18,19 , and strontium monohydroxide (SrOH) 20,21 were successfully cooled down to ultralow (< 1 mK) temperatures using Sisyphus laser cooling.…”

Section: Introductionmentioning

confidence: 99%

Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studies

Wójcik

Korona

Tomza

2019

The Journal of Chemical Physics

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We consider collisional properties of polyatomic aromatic hydrocarbon molecules immersed into ultracold atomic gases and investigate intermolecular interactions of exemplary benzene, naphthalene, and azulene with alkali-metal (Li, Na, K, Rb, Cs) and alkaline-earth-metal (Mg, Ca, Sr, Ba) atoms. We apply the stateof-the-art ab initio techniques to compute the potential energy surfaces (PESs). We use the coupled cluster method restricted to single, double, and noniterative triple excitations to reproduce the correlation energy and the small-core energy-consistent pseudopotentials to model the scalar relativistic effects in heavier metal atoms. We also report the leading long-range isotropic and anisotropic dispersion and induction interaction coefficients. The PESs are characterized in detail and the nature of intermolecular interactions is analyzed and benchmarked using symmetry-adapted perturbation theory. The full three-dimensional PESs are provided for selected systems within the atom-bond pairwise additive representation and can be employed in scattering calculations. Presented study of the electronic structure is the first step towards the evaluation of prospects for sympathetic cooling of polyatomic aromatic molecules with ultracold atoms. We suggest azulene, an isomer of naphthalene which possesses a significant permanent electric dipole moment and optical transitions in the visible range, as a promising candidate for electric field manipulation and buffer-gas or sympathetic cooling.

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“…More longterm, ultracold Rydberg atoms might be combined with the more advanced sources of cold and ultracold molecules present in our group [33]. The combination of buffer-gas cooling with centrifuge deceleration provides motionally and internally cold ensembles of molecules for a wide range of molecules species [34,35]. Moreover, optoelectrical Sisyphus cooling combined with optical pumping provides state selected ensembles of ultracold formaldehyde [36].…”

Section: Discussionmentioning

confidence: 99%

State resolved investigation of Förster resonant energy transfer in collisions between polar molecules and Rydberg atoms

Jarisch

Zeppenfeld

2018

New J. Phys.

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We perform a comprehensive investigation of Förster resonant energy transfer in a room-temperature thermal mixture of ammonia molecules and rubidium Rydberg atoms. Fully state-resolved measurement of the Rydberg-atom populations is achieved by combining millimeter-wave state transfer with state-selective field ionization. This allows aspects of the energy transfer process such as state dependence, ammonia pressure dependence, and dependence on the energy resonance condition to be investigated in detail. Our results pave the way for future quantum experiments combining polar molecules and Rydberg atoms.

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A cryofuge for cold-collision experiments with slow polar molecules

Cited by 77 publications

References 50 publications

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studies

State resolved investigation of Förster resonant energy transfer in collisions between polar molecules and Rydberg atoms

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