Changing a velocity distributions

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SUMMARY

The discussion centers on the implications of altering a Gaussian velocity distribution for a collection of particles, specifically regarding whether this change constitutes cooling. One participant argues that cooling is a collective parameter affecting all atoms, while another points out that in the context of laser cooling, a subset of atoms can indeed be considered cooled despite the overall distribution remaining unchanged. The conversation highlights the nuanced understanding of temperature and kinetic energy in relation to velocity distributions.

PREREQUISITES
  • Understanding of Gaussian velocity distributions
  • Knowledge of kinetic energy and its relationship to temperature
  • Familiarity with concepts in laser cooling
  • Basic principles of statistical mechanics
NEXT STEPS
  • Research the principles of laser cooling techniques
  • Explore the relationship between kinetic energy and temperature in statistical mechanics
  • Study the effects of velocity distribution changes on particle systems
  • Investigate advanced topics in thermodynamics related to atomic cooling
USEFUL FOR

Physicists, researchers in atomic and molecular physics, and anyone interested in the principles of cooling mechanisms in particle systems.

Niles
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Hi

Say I have a Gaussian velocity distribution for a collection of particles. Then I make a change to the setup in a way that the velocity distribution changes. This change is such that a part (not all) of the distribution gets bunched into one particular velocity class lower than the mean of the Gaussian.

Does this constitute cooling of the atoms as well as slowing? I would say no myself, as "cooling" is a collective parameter of all the atoms, not just some of them.


Niles.
 
Physics news on Phys.org
The velocities are still random?
What is the relationship between randomized kinetic energy (and, therefore, speed) and temperature?
 
Niles said:
Hi

Say I have a Gaussian velocity distribution for a collection of particles. Then I make a change to the setup in a way that the velocity distribution changes. This change is such that a part (not all) of the distribution gets bunched into one particular velocity class lower than the mean of the Gaussian.

Does this constitute cooling of the atoms as well as slowing? I would say no myself, as "cooling" is a collective parameter of all the atoms, not just some of them.


Niles.
It is considered cooling in the laser-cooling field, with the understanding that it is a subset of the entire collection of atoms that has been cooled.
 

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