What is the collision probability for an energetic photon in free space?

In summary, the probability of an energetic photon interacting with ions in free space is dependent on the ion gas density and the photon's wavelength. However, this cannot be treated as a classical collision and would require a more complex treatment such as QED/QFT. The effective cross sectional area for the collision typically peaks at certain energies where the available energy matches the energy required to excite the ion. Additionally, the identity of the ions also plays a role in the interaction, with spectral lines being a factor. It is possible to calculate the probability for interaction using the Klein-Nishina formula, but this does not show results similar to a particle.
  • #1
Ponderer
104
1
Hi. Does anyone know the probability of an energetic photon interacting with ions in free space if we know the ion gas density and the photons wavelength? I'm trying to find out if the energetic photon is treated like a particle where its size is relative to it's wavelength. In other words, is it similar to the collision probability of a particle being shot inside a particle gas chamber? Thanks!
 
Physics news on Phys.org
  • #2
It definitely cannot be treated as a classical collision. The full treatment would require stuff (QED/QFT) which is way beyond me. The size that you are after is the effective cross sectional area for the collision and typically peaks at certain energies where the available energy from the collision matches the energy required to excite the ion. It has nothing to do with the wavelength.
 
  • Like
Likes Ponderer
  • #3
Photon interaction is very much dependent on the identity of the ions - spectral lines.
 
  • Like
Likes Ponderer
  • #4
Yes that's what I thought, but was just wondering if it can be made to show results like a particle. If for example we use electrons for the ions, then I was wondering if the probability for interaction was relative to the gamma rays wavelength.
 

Related to What is the collision probability for an energetic photon in free space?

1. What is photon collision probability?

Photon collision probability is a measure of the likelihood that two photons will interact or collide with each other. It is determined by the properties of the photons, such as their energy and direction of travel, as well as the environment in which they are present.

2. How is photon collision probability calculated?

The calculation of photon collision probability involves taking into account various factors such as the number of photons present, their energy levels, and the cross-section of the particles involved. These factors are used to determine the likelihood of interaction between the photons.

3. Why is photon collision probability important in research?

Photon collision probability is important in research because it helps scientists understand the behavior of light and how it interacts with matter. This information is crucial in fields such as quantum mechanics, astrophysics, and particle physics.

4. Can photon collision probability be altered or controlled?

Yes, photon collision probability can be altered or controlled by changing the properties of the photons, such as their energy levels, or by adjusting the environment in which they are present. This can be done in experiments to study specific behaviors or in applications such as laser technology.

5. Is photon collision probability the same for all types of photons?

No, photon collision probability can vary depending on the type of photons involved. For example, high-energy photons such as gamma rays have a higher probability of collision compared to lower-energy photons like visible light. The probability can also change depending on the properties and environment of the photons.

Similar threads

  • Quantum Physics
Replies
29
Views
2K
Replies
8
Views
1K
Replies
16
Views
1K
Replies
4
Views
941
  • Quantum Physics
Replies
12
Views
2K
Replies
46
Views
2K
  • Quantum Physics
Replies
25
Views
3K
  • Quantum Physics
Replies
4
Views
762
  • Quantum Physics
Replies
12
Views
2K
Back
Top