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Forums
Physics
Quantum Physics
Cold vs hot on the atomic scale
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[QUOTE="DrClaude, post: 6413378, member: 461323"] Temperature is a collective phenomenon. We cannot talk the temperature of one atom or one photon. For a gas of photons, it is not their speed that is related to temperature, since they always move at ##c##. What we have is a distribution of the photons' energy (or frequency, or wavelength) that depends on temperature. In laser cooling the atoms are slowed down. No experiment is perfect, but the cooling results from the slowing down, not from the loss of hot atoms. However, there is a limit to the temperature that can be achieved by laser cooling (of the order of 1-10 μK), such that in experiments where lower temperatures are needed, for instance to achieve Bose-Einstein condensation, after the laser cooling phase there is an evaporative cooling phase, where cooling is obtained by letting the hottest atoms escape. [/QUOTE]
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Forums
Physics
Quantum Physics
Cold vs hot on the atomic scale
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