O Physics: Bose-Einstein Condensates and Laser Cooling

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Discussion Overview

The discussion revolves around the concepts of heat, black body radiation, and laser cooling in the context of Bose-Einstein condensates. Participants explore the mechanisms of thermal radiation and the potential reversibility of atomic states in Bose-Einstein condensates.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes heat as transferable energy that increases thermal energy, questioning the relationship between heat and black body radiation.
  • Another participant elaborates on the human body's radiation, referencing Planck's law and Wien's displacement law to explain the infrared radiation emitted by the body.
  • There is a discussion about the complexity of photon emission and absorption by groups of atoms, mentioning phonon behavior and collective motion.
  • One participant raises a question about the reversibility of the process in laser cooling and whether atoms can regain their individual identity after forming a Bose-Einstein condensate.
  • A later reply suggests that it seems possible for atoms to return to their original state, but this is noted as a different question that may warrant a new thread.

Areas of Agreement / Disagreement

Participants express differing views on the reversibility of atomic states in Bose-Einstein condensates, with some suggesting it may be possible while others indicate that the question is distinct from the initial topic of thermal radiation.

Contextual Notes

The discussion includes complex mechanisms of photon emission and absorption that are not fully resolved, and the potential for reversibility in atomic states remains uncertain.

fredreload
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Heat is a type of energy that is transferable and increases thermal energy. Thermal energy is being released as infrared radiation hence the term heat vision. Does that mean heat is capable of producing so called black body radiation here. Is the infrared radiation caused by the photon emission of the objects or something else?
 
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fredreload said:
Heat is a type of energy that is transferable and increases thermal energy. Thermal energy is being released as infrared radiation hence the term heat vision. Does that mean heat is capable of producing so called black body radiation here. Is the infrared radiation caused by the photon emission of the objects or something else?
The human body will radiate energy and the frequency/energy spectrum of that radiation will be determined by the laws of blackbody radiation (Planck's law). The Wien's displacement law relates the peak wavelength of the radiation to the temperature of the blackbody. In the case of the human body which has a temperature of 37°C or 310K, the peak wavelength will be about 10 microns or 10,000 nm which is within the infrared range. Almost all radiation will be in the infrared region but there will be some very small amount of visible radiation.

The actual mechanism by which the photons are emitted or absorbed by groups of atoms is rather complex. Groups of atoms can absorb or emit photons by acting collectively and this involves phonon behaviour. Suffice it to say that groups of connected molecules that are moving about due to thermal motion will radiate electro-magnetic energy.

AM
 
Last edited:
Hmm, I'm actually looking at the concept of laser cooling. At Bose-Einstein condensate the atom loses its individual identity, is it possible to reverse this process for atom to form again?
 
It seems possible for it to return to its original state here.
 
fredreload said:
Hmm, I'm actually looking at the concept of laser cooling. At Bose-Einstein condensate the atom loses its individual identity, is it possible to reverse this process for atom to form again?
This is quite a different question. You should start a new thread for this.

AM
 

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