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On 2024-09-22 7:02, Chris M. Thomasson wrote:Thanks!On 9/21/2024 6:28 PM, MitchAlsup1 wrote:It's not done that way - the laser beams are continuous, but they are tuned and/or polarized to interact more with particles moving the "wrong way", slowing them down on the average, which means cooling them. The particles "self select" to interact with the beams, based on Doppler effects or other effects that depend on particle movements.On Sat, 21 Sep 2024 23:55:13 +0000, Lawrence D'Oliveiro wrote:>
>On Sat, 21 Sep 2024 13:43:55 -0700, Chris M. Thomasson wrote:>
>On 9/21/2024 1:22 AM, Lawrence D'Oliveiro wrote:>
>On Fri, 20 Sep 2024 15:33:23 -0700, Chris M. Thomasson wrote:>
>Is there any activity going on at absolute zero?>
No, because the Third Law of Thermodynamics says you can’t get there
anyway.
How close can one get?
Arbitrarily close. I heard of experiments already being done in the
microkelvin range.
>
Correction: just checked, and the Guinness World Record site reports a
figure of 38pK.
Using lasers to slow the particles down !
>
When a particle is vibrating towards the laser, a picosecond blast
of energy slows it back down. Using heat to achieve cold.
Targeting a single particle without casting any effect on any other particle? Can that be done?
https://en.wikipedia.org/wiki/Laser_cooling
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