Direct observation of swap cooling in atom-ion collisions
- URL: http://arxiv.org/abs/2012.07759v3
- Date: Mon, 17 May 2021 13:52:43 GMT
- Title: Direct observation of swap cooling in atom-ion collisions
- Authors: Amir Mahdian, Artjom Kr\"ukow, Johannes Hecker Denschlag
- Abstract summary: 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.
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.
We expect swap cooling to occur quite universally in any homo-nuclear atom-ion collision.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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.
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