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Title: Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms
Authors: Taillandier-Loize, T.
Perales, F.
Baudon, J.
Hamamda, M.
Bocvarski, V.
Ducloy, Martial
Correia, F.
Fabre, N.
Dutier, G.
Keywords: Ultra-low Collision
Cross Section
Issue Date: 2018
Source: Taillandier-Loize, T., Perales, F., Baudon, J., Hamamda, M., Bocvarski, V., Ducloy, M., . . . Dutier, G. (2018). Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(8), 085202-. doi:10.1088/1361-6455/aab52a
Series/Report no.: Journal of Physics B : Atomic, Molecular and Optical Physics
Abstract: The collision between a spin-polarized metastable argon atom in Ar* (3p54s, 3P2, M = +2) state slightly decelerated by the Zeeman slower-laser technique and a co-propagating thermal ground state argon atom Ar (3p6, 1S0), both merged from the same supersonic beam, but coming through adjacent slots of a rotating disk, is investigated at the 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 explored energy 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(3P2) and 2u(3P2). 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 also be discussed. The experimental method is versatile and could be applied using different isotopes of Argon like 36Ar combined with 40Ar, 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.
ISSN: 0953-4075
DOI: 10.1088/1361-6455/aab52a
Rights: © 2018 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics B: Atomic, Molecular and Optical Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
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