Electron Energy Level Transitions

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Discussion Overview

The discussion revolves around electron energy level transitions in atoms, particularly focusing on the processes of photon absorption and emission. It explores how these transitions occur in both atomic systems and in humans, considering the implications of energy levels and thermal motion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether an atom can make a single jump back to the ground state after absorbing a photon and whether it would emit a photon of the same energy.
  • Another participant affirms that an atom can emit a photon of the same energy after a single jump back to the ground state.
  • Concerns are raised about how emission transitions work for humans absorbing high-energy light photons and why the emitted photons are typically infrared rather than visible light.
  • It is suggested that light interacts with matter in various ways, increasing the random thermal motion of atoms, leading to re-emission as black body radiation, which is infrared for room temperature objects.
  • A participant seeks clarification on what dictates whether discrete electron energy level transitions occur or if random thermal motion dominates in different types of matter.

Areas of Agreement / Disagreement

Participants express differing views on the nature of photon emission and the factors influencing energy transitions, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

The discussion highlights the complexity of photon interactions with matter, including the dependence on material properties and conditions, but does not resolve the underlying assumptions or mechanisms involved.

Jimmy87
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When an atom absorbs a photon of light and gets into an excited state, can it ever make a single jump back down to the ground state? For example, if an atom absorbed a blue photon of light then jumped straight back down to the ground state would it then emit a blue photon? How does emission transitions work for humans that continually absorb high energy light photons? For example, if a human is absorbing visible light photons then doesn't the emission photon have to equal that energy gap? So why is the re-radiated photon always infrared for humans? I would guess that the emission is staggered on its way back to the ground state but what dictates this? Any help answering any of these points is much appreciated.
 
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Jimmy87 said:
When an atom absorbs a photon of light and gets into an excited state, can it ever make a single jump back down to the ground state? For example, if an atom absorbed a blue photon of light then jumped straight back down to the ground state would it then emit a blue photon?
Yes, sure.

Jimmy87 said:
How does emission transitions work for humans that continually absorb high energy light photons? For example, if a human is absorbing visible light photons then doesn't the emission photon have to equal that energy gap? So why is the re-radiated photon always infrared for humans?
Light doesn't just excite atoms. It interacts with matter in other ways too. When it shines on an object it increases the random thermal motion of the atoms, and the object warms up. Later it gets re-emitted as black body radiation, which for room temperature objects means infrared.
 
Bill_K said:
Yes, sure.


Light doesn't just excite atoms. It interacts with matter in other ways too. When it shines on an object it increases the random thermal motion of the atoms, and the object warms up. Later it gets re-emitted as black body radiation, which for room temperature objects means infrared.


Thanks for your answer. So what dictates whether you get a discrete electron energy level transitions in some matter or just random thermal motion in other types of matter?
 
You always get both
 

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