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- W4212910553 abstract "Collisions with cold particles can dissipate the energy of a hot particle and therefore be exploited as a cooling mechanism. Kinetics teaches us that for a particle to be cooled down by several orders of magnitude, it will typically take many elastic collisions as each one only carries away a certain fraction of the collision energy. Recently, for a system consisting of hot ions and cold atoms, a much faster cooling process has been suggested where cooling over several orders of magnitude can occur in a single step. Namely, in a homo-nuclear atom-ion collision, an electron can resonantly hop from an ultracold atom onto the hot ion, converting the cold atom into a cold ion. Here, we demonstrate such swap cooling in a direct way as we experimentally observe how a single energetic ion loses energy in a cold atom cloud. In order to contrast swap cooling with standard sympathetic cooling, we perform the same measurements with a hetero-nuclear atom-ion system, for which swap cooling cannot take place, and indeed observe much different cooling dynamics. Ab initio numerical model calculations agree well with our measured data and corroborate our interpretations. We expect swap cooling to occur quite universally in any homo-nuclear atom-ion collision. It should therefore be a ubiquitous process in mixed atom-ion gases and plasmas. Furthermore, it offers interesting prospects for fast cooling applications." @default.
- W4212910553 created "2022-02-24" @default.
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- W4212910553 date "2021-06-01" @default.
- W4212910553 modified "2023-10-14" @default.
- W4212910553 title "Direct observation of swap cooling in atom–ion collisions" @default.
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- W4212910553 doi "https://doi.org/10.1088/1367-2630/ac0575" @default.
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