Photon emission in electronic transitions

In summary, at a basic level, we observe that only one photon is emitted when an electron in an atom changes its energy level. This is due to quantum selection rules and is a fundamental difference between physics and philosophy or math. While multiphoton emission has been observed, it is not as common and requires a deeper understanding of quantum mechanics.
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MuonMinus
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How would you explain, on a basic level, why only one photon (as opposed to two, three...) is emitted when an electron in an atom changes its energy level? This is for students with only introductory Physics background.
 
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  • #2
I know this isn't the answer you're looking for, but...
That's how we observe that the universe works. We only ever see 1 photon. It's not just a glib answer, it is the difference between physics and philosophy or math.
 
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  • #3
MuonMinus said:
How would you explain, on a basic level, why only one photon (as opposed to two, three...) is emitted when an electron in an atom changes its energy level? This is for students with only introductory Physics background.

At the introductory level it is indeed mysterious, especially since multiphoton absorption is a common laboratory technique. Multiphoton emission has been observed and reported on, but explanations 'why' photoemission is predominantly single-photon requires discussion of the 'selection rules' which are quantum and not introductory.
 

1. What is photon emission in electronic transitions?

Photon emission in electronic transitions refers to the process in which an electron in an atom or molecule moves from a higher energy state to a lower energy state, emitting a photon of light in the process. This is a fundamental process in the field of quantum mechanics and is responsible for the emission of light in various phenomena such as fluorescence and phosphorescence.

2. How does photon emission occur in electronic transitions?

Photon emission occurs when an electron in an excited energy state loses energy and transitions to a lower energy state. This loss of energy is emitted as a photon of light with a specific wavelength that corresponds to the energy difference between the two states.

3. What factors determine the energy of the emitted photon in electronic transitions?

The energy of the emitted photon is determined by the energy difference between the initial and final energy states of the electron. This difference in energy is dependent on the specific atom or molecule and the electronic configuration of the electron.

4. How is photon emission in electronic transitions related to the color of light?

The color of light emitted in an electronic transition is determined by the energy of the photon. Light with shorter wavelengths (higher energy) appears blue or violet, while light with longer wavelengths (lower energy) appears red or orange. Therefore, the color of light emitted in electronic transitions can provide information about the energy states of the electron and the substance emitting the light.

5. What are some real-world applications of photon emission in electronic transitions?

Photon emission in electronic transitions has numerous applications in everyday life, including fluorescent lighting, LED displays, and laser technology. It is also essential in fields such as spectroscopy, where the emitted photons can provide valuable information about the molecular structure of a substance.

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