Atom diffraction with a ‘natural’ metastable atom nozzle beam

Karam, J.-C.; Wipf, N.; Grucker, Jules; Perales, F.; Boustimi, M.; Vassilev, G.; Bocvarski, V.; Mainos, C.; Baudon, J.; Robert, J.

doi:10.1088/0953-4075/38/15/009

Cited by 17 publications

(24 citation statements)

References 22 publications

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“…Also, the ultralow energy limit is discussed, presenting a large scattering length, and a probable large number of bounded states for the Ar* ( 3 P 0 and 3 P 2 ) + Ar system. At the end of this section, we shall explain why exchange of velocities from two different sources can be very efficient at much lower energy, justifying the results of [15] where final metastable state populations of 3 P 0 and 3 P 2 are in the proportion 33.8% to 66.2% rather than the usual stoichiometric proportion 1/6 to 5/6 obtained after electronic collisions.…”

Section: Introductionmentioning

confidence: 60%

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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Section: Introductionmentioning

confidence: 60%

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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“…In the present experiment, this is achieved by using an ultra narrow metastable atom beam generated from a Camparguetype [2] nozzle beam of ground state atoms, by metastability exchange [3]. In the present experiment, this is achieved by using an ultra narrow metastable atom beam generated from a Camparguetype [2] nozzle beam of ground state atoms, by metastability exchange [3].…”

Section: Diffraction By a Magnetic Id Reflection Gratingmentioning

confidence: 71%

Coherent Atom Optics With Fast Metastable Beams: Metastable Helium Diffraction By 1D and 2D Magnetized Reflection Gratings

Grucker¹,

Baudon²,

Karam³

et al. 2007

AIP Conference Proceedings

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Extremely surface-sensitive hysteresis loop measurement with a spin-polarized metastable helium atom beam Abstract. ID and 2D reflection gratings (Permalloy stripes or dots deposited on silicon), immersed in an external homogeneous static magnetic field, are used to study ID and 2D diffraction of fast metastable helium atoms He* (2 3 S0. Both the grazing incidence used here and the repulsive potential (for sub-level m = -1) generated by the magnetisation reduce the quenching effect. This periodically structured potential is responsible for the diffraction in the incidence plane as well as for the diffraction in the perpendicular plane.

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“…Note that it corrects the rather crude approximation given in Ref. [43]. The advantage of using a slow atomic beam with a well-defined velocity rather than a thermal beam derives from the fact that the atom-surface interaction poten-tial can be probed to a much higher accuracy.…”

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confidence: 67%

Intermediate-Range Casimir-Polder Interaction Probed by High-Order Slow Atom Diffraction

et al. 2021

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At nanometer separation, the dominant interaction between an atom and a material surface is the fluctuation-induced Casimir-Polder potential. We demonstrate that slow atoms crossing a silicon nitride transmission nanograting are a remarkably sensitive probe for that potential. A 15% difference between nonretarded (van der Waals) and retarded Casimir-Polder potentials is discernible at distances smaller than 51 nm. We discuss the relative influence of various theoretical and experimental parameters on the potential in detail. Our work paves the way to high-precision measurement of the Casimir-Polder potential as a prerequisite for understanding fundamental physics and its relevance to applications in quantum-enhanced sensing.

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Atom diffraction with a ‘natural’ metastable atom nozzle beam

Cited by 17 publications

References 22 publications

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

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

Coherent Atom Optics With Fast Metastable Beams: Metastable Helium Diffraction By 1D and 2D Magnetized Reflection Gratings

Intermediate-Range Casimir-Polder Interaction Probed by High-Order Slow Atom Diffraction

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