Do neutral atom collisions affect the continuous nature of black body radiation?

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Discussion Overview

The discussion revolves around the effects of neutral atom collisions on the continuous nature of black body radiation. Participants explore whether such collisions can shift eigenfunctions and create temporary dipoles, focusing on theoretical implications and models rather than experimental outcomes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions if neutral atom collisions shift eigenfunctions and create temporary dipoles, assuming no free electrons are involved.
  • Another participant clarifies that in interactions, the status of electrons is not straightforward, suggesting a more complex relationship during collisions.
  • A participant asserts that neutral atom collisions can indeed shift eigenfunctions and create temporary dipoles due to van der Waals interactions, which polarize nearby atoms.
  • Further elaboration indicates that the wave function of a two-atom system can be modeled as a product of internal motion and center of mass motion, with temporary changes in eigenstates during close interactions.
  • It is noted that in some cases, atoms may form bound states, complicating the representation of the final state wavefunction.
  • A participant questions whether these interactions account for the continuous energy distribution in a monoatomic nonionized substance.

Areas of Agreement / Disagreement

Participants express varying degrees of agreement on the effects of neutral atom collisions, with some supporting the idea of eigenfunction shifts and temporary dipoles, while others raise questions about the implications and complexities involved. The discussion remains unresolved regarding the overall impact on black body radiation.

Contextual Notes

Participants acknowledge the complexity of interactions and the potential for bound states, which may influence the interpretation of eigenfunction behavior during collisions. There are also assumptions regarding the nature of electron involvement in these interactions that remain unaddressed.

Getterdog
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I’ve read everything I can here and in the stack exchange on the topic of the continuous nature of black body radiation and it’s been really helpful,but I’m lead now to this question. Do neutral atom collisions shift the eigenfunctions,during the collisions? Do collisions create temporary dipoles? I’m Assuming no free electrons,just collisions in neutral atoms.thanks jk
 
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I assume by not free you are regarding an electron as belonging to some atom or another. In an interaction it is not so clear cut.
 
Getterdog said:
Do neutral atom collisions shift the eigenfunctions,during the collisions? Do collisions create temporary dipoles?
Yes to both. The van der Waals interaction leads to the polarisation of two atoms that are not too far from each other. This can be seen as shifting the energy levels with respect to the isolated atom.
 
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Getterdog said:
I’ve read everything I can here and in the stack exchange on the topic of the continuous nature of black body radiation and it’s been really helpful,but I’m lead now to this question. Do neutral atom collisions shift the eigenfunctions,during the collisions? Do collisions create temporary dipoles? I’m Assuming no free electrons,just collisions in neutral atoms.thanks jk

In some collisions we can think of the wave function of the two-atom system as a product of the wave function for the internal motion in the atoms (relative position of electrons w.r.t. the nuclei) and a wave function for the center of mass motion of the atoms. Then you can model the collision in a way where the internal motion eigenstates change temporarily when the atoms get close enough to interact. In some other cases the two atoms can form a bound state, as in the recombination of two chlorine atoms to form a ##Cl_2## molecule - then you can't write the final state wavefunction in the same way as a combination of separate atoms because there's a covalent bond formed.
 
hilbert2 said:
In some collisions we can think of the wave function of the two-atom system as a product of the wave function for the internal motion in the atoms (relative position of electrons w.r.t. the nuclei) and a wave function for the center of mass motion of the atoms. Then you can model the collision in a way where the internal motion eigenstates change temporarily when the atoms get close enough to interact. In some other cases the two atoms can form a bound state, as in the recombination of two chlorine atoms to form a ##Cl_2## molecule - then you can't write the final state wavefunction in the same way as a combination of separate atoms because there's a covalent bond formed.
Does this then account for the more or less continuous distribution of energy for a monoatomic nonionized substance? Thanks jk
 

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