Trapping Cold Ground State Argon Atoms

Edmunds, PD; Barker, P. F.

doi:10.1103/physrevlett.113.183001

Cited by 10 publications

(12 citation statements)

References 37 publications

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“…Recently, Edmunds and Barker 31 demonstrated the realization of the trapping of argon atoms in the ground state by optically quenching them from a laser-cooled metastable state. The method can be applied to other rare gases 55 and opens the way for studying cold or ultracold NH 3 -Rg collisions, as well as for sympathetic cooling of molecules such as ammonia.…”

Section: E Sympathetic Cooling Of Ammoniamentioning

confidence: 99%

“…For example, the rotational cooling of ammonia seeded into a helium supersonic jet was recently modeled by taking into account rotationally inelastic NH 3 -He collisions. 30 The recent report of the experimental trapping of cold ground state argon atoms 31 also suggests that the sympathetic cooling of molecules such as ammonia might be realized by thermalizing collisions with rare gases. The possibility of sympathetically cooling NH 3 using laser-cooled alkali atoms has been investigated previously 32 but the potential energy surfaces for these systems were deemed too anisotropic.…”

Section: Introductionmentioning

confidence: 99%

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Scattering of NH3 and ND3 with rare gas atoms at low collision energy

Loreau

Avoird²

2015

The Journal of Chemical Physics

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We present a theoretical study of elastic and rotationally inelastic collisions of NH 3 and ND 3 with rare gas atoms (He, Ne, Ar, Kr, Xe) at low energy. Quantum close-coupling calculations have been performed for energies between 0.001 and 300 cm −1 . We focus on collisions in which NH 3 is initially in the upper state of the inversion doublet with j = 1, k = 1, which is the most relevant in an experimental context as it can be trapped electrostatically and Stark-decelerated. We discuss the presence of resonances in the elastic and inelastic cross sections, as well as the trends in the inelastic cross sections along the rare gas series and the differences between NH 3 and ND 3 as a colliding partner. We also demonstrate the importance of explicitly taking into account the umbrella (inversion) motion of NH 3 in order to obtain accurate scattering cross sections at low collision energy. Finally, we investigate the possibility of sympathetic cooling of ammonia using cold or ultracold rare gas atoms. We show that some systems exhibit a large ratio of elastic to inelastic cross sections in the cold regime, which is promising for sympathetic cooling experiments. The close-coupling calculations are based on previously reported ab initio potential energy surfaces for NH 3 -He and NH 3 -Ar, as well as on new, four-dimensional, potential energy surfaces for the interaction of ammonia with Ne, Kr, and Xe, which were computed using the coupled-cluster method and large basis sets. We compare the properties of the potential energy surfaces corresponding to the interaction of ammonia with the various rare gas atoms. C 2015 AIP Publishing LLC. [http://dx

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Section: E Sympathetic Cooling Of Ammoniamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scattering of NH3 and ND3 with rare gas atoms at low collision energy

Loreau

Avoird²

2015

The Journal of Chemical Physics

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“…To load the MOT, a thermal effusive beam of metastable argon atoms is decelerated in a Zeeman slower shown in figure 6. Neutral atoms are introduced into an RF discharge by the effusive beam of neutral argon atoms [21]. The MOT sits in a chamber held at 1 × 10 −8 mbar and the atoms are laser cooled using three orthogonal, counter propagating beams arranged such that there is no cooling beam in the vertical axis.…”

Section: Tunable Low-velocity Metastable Argon Beammentioning

confidence: 99%

Characterising a tunable, pulsed atomic beam using matter-wave interferometry

Morley

Flack

Hiley

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We describe the creation and characterisation of a velocity tunable, spin-polarized beam of slow metastable argon atoms. We show that the beam velocity can be determined with a precision below 1% using matter-wave interferometry. The profile of the interference pattern was also used to determine the velocity spread of the beam, as well as the Van der Waals (VdW) co-efficient for the interaction between the metastable atoms and the multi-slit silicon nitride grating. The VdW co-efficient was determined to be C 3 = 1.84 ± 0.17 a.u., in good agreement with values derived from spectroscopic data. Finally, the spin polarization of the beam produced during acceleration of the beam was also measured, demonstrating a spatially uniform spin polarization of 96% in the m = +2 state.

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“…Filled and open circles are respectively gerade and ungerade data points from [11,12], continuous and dashed lines are our analytical expressions (validity is ensured for R > 6 a 0 ). Notice that points at R = 12 a 0 are already very close to each other.…”

Section: Figurementioning

confidence: 99%

Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms

Taillandier-Loize¹,

Perales²,

Baudon³

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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The collision between a spin polarized metastable argon atom in Ar* (3p 5 4s, 3 P 2 , M = +2) state slightly decelerated by the Zeeman slower-laser technique and a co-propagating thermal ground state argon atom Ar (3p 6 , 1 S 0 ), both merged from the same supersonic beam, but coming through adjacent slots of a rotating disk, is investigated at center-of-mass energies ranging from 1 to 10 meV. The duration of the laser pulse synchronised with the disk allows the tuning of the relative velocity and thus the collision energy. At these sub-thermal energies, the "resonant metastability transfer" signal is too small to be evidenced. The energy explored range requires using indiscernibility amplitudes for identical isotopes to have a correct interpretation of the experimental results. Nevertheless, excitation transfers are expected to increase significantly at much lower energies as suggested by previous theoretical predictions of potentials 2g ( 3 P 2 ) and 2u ( 3 P 2 ). Limits at ultra-low collisional energies of the order of 1 mK (0.086 µeV) or less, where gigantic elastic cross-sections are expected, will be also discussed. The experimental method is versatile and could be applied using different isotopes of Argon like 36 Ar combined with 40 Ar, as well as other rare gases among which Krypton should be of great interest thanks to the available numerous isotopes present in a natural gas mixture.

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Trapping Cold Ground State Argon Atoms

Cited by 10 publications

References 37 publications

Scattering of NH3 and ND3 with rare gas atoms at low collision energy

Scattering of NH3 and ND3 with rare gas atoms at low collision energy

Characterising a tunable, pulsed atomic beam using matter-wave interferometry

Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms

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