Understanding Atom-Photon Interaction: How Long Will an Electron Hold Energy?

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Discussion Overview

The discussion centers around the interaction between atoms and photons, specifically focusing on how long an electron holds energy after absorbing a photon and the implications for electron configuration in the case of Neon. Participants explore the nature of photon absorption, energy levels, and the factors influencing the duration of energy retention.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant notes that when an atom absorbs a photon, it jumps to a higher energy level, but questions remain about the duration of this energy retention and the role of the photon in this process.
  • Another participant suggests looking into 'selection rules' to understand the conditions under which photon absorption occurs.
  • A participant clarifies that the energy of the photon must match specific energy transitions for absorption to occur, indicating that the electron may transition to various energy levels depending on the photon's energy.
  • Further elaboration is provided on the excitation lifetime of an isolated molecule, which can depend on available states for relaxation and may involve non-radiative processes.
  • One participant offers a conceptual framework for understanding the interaction, suggesting that the excited state wave function represents a system of the atom/molecule and the photon, although this does not fully explain the mechanism of interaction.

Areas of Agreement / Disagreement

Participants express varying degrees of understanding regarding the specifics of photon absorption and energy retention. There is no consensus on the exact mechanisms or implications of these processes, indicating that multiple views and uncertainties remain in the discussion.

Contextual Notes

Limitations include the dependence on the specific energy levels of Neon and the complexities of quantized light fields, which are not fully resolved in the discussion.

QuarkCharmer
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I am told that when an atom absorbs a photon, it jumps up an energy level, these are discrete levels of energy etc etc. What determines how long the electron will hold this energy, and what exactly is the photon (wave) doing to up it's energy level. For ease of explanation, let's assume Neon (1s^2 2s^2 2p^6) takes in a photon particle/wave. Is it now at the third energy level? How does this effect it's electron configuration?

I'm having a difficult time finding the answer to this question. Thanks
 
Physics news on Phys.org
you might google 'selection rules'
 
QuarkCharmer said:
let's assume Neon (1s^2 2s^2 2p^6) takes in a photon particle/wave. Is it now at the third energy level?

It depends on the energy of the photon. In order for the atom to absorb the photon, the photon's energy has to match one of the possible upward transitions. It might kick an electron from n=2 to n=3 or from n=2 to n=4 or from n=1 to n=3, etc. Or it might do nothing at all because its energy doesn't match any transition.
 
QuarkCharmer said:
I am told that when an atom absorbs a photon, it jumps up an energy level, these are discrete levels of energy etc etc. What determines how long the electron will hold this energy, and what exactly is the photon (wave) doing to up it's energy level. For ease of explanation, let's assume Neon (1s^2 2s^2 2p^6) takes in a photon particle/wave. Is it now at the third energy level? How does this effect it's electron configuration?

I'm having a difficult time finding the answer to this question. Thanks

The excitation lifetime of an isolated molecule is one thing:
http://en.wikipedia.org/wiki/Fluorescence#Lifetime
and can depend on the number and type of states that it's allowed to relax to,
but it can also become de-excited by other non-radiative processes.

As to your other question, I have no direct experience with quantized light fields, so this may be an oversimplified idea, but in terms of what the photon is "doing", you can think of any excited state wave function as describing a atom/molecule + photon system, and what it's "doing" is making up the difference between the ground and excited states. I guess that doesn't really explain "what it's doing" but just "how to think about it". Hope that was at all helpful.
 

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