Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms
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...
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sg-ntu-dr.10356-872202023-02-28T19:32:14Z Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms Taillandier-Loize, T. Perales, F. Baudon, J. Hamamda, M. Bocvarski, V. Ducloy, Martial Correia, F. Fabre, N. Dutier, G. School of Physical and Mathematical Sciences Ultra-low Collision Cross Section DRNTU::Science::Physics 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. Accepted version 2019-05-22T07:14:35Z 2019-12-06T16:37:31Z 2019-05-22T07:14:35Z 2019-12-06T16:37:31Z 2018 Journal Article 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 0953-4075 https://hdl.handle.net/10356/87220 http://hdl.handle.net/10220/48318 10.1088/1361-6455/aab52a en Journal of Physics B : Atomic, Molecular and Optical Physics © 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 https://doi.org/10.1088/1361-6455/aab52a. 22 p. application/pdf |
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Ultra-low Collision Cross Section DRNTU::Science::Physics Taillandier-Loize, T. Perales, F. Baudon, J. Hamamda, M. Bocvarski, V. Ducloy, Martial Correia, F. Fabre, N. Dutier, G. Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
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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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Taillandier-Loize, T. Perales, F. Baudon, J. Hamamda, M. Bocvarski, V. Ducloy, Martial Correia, F. Fabre, N. Dutier, G. |
format |
Article |
author |
Taillandier-Loize, T. Perales, F. Baudon, J. Hamamda, M. Bocvarski, V. Ducloy, Martial Correia, F. Fabre, N. Dutier, G. |
author_sort |
Taillandier-Loize, T. |
title |
Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
title_short |
Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
title_full |
Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
title_fullStr |
Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
title_full_unstemmed |
Low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
title_sort |
low energy collisions of spin-polarized metastable argon atoms with ground state argon atoms |
publishDate |
2019 |
url |
https://hdl.handle.net/10356/87220 http://hdl.handle.net/10220/48318 |
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1759856715448188928 |