How an electron can re-radiate an electromagnetic wave

In summary, when an electron is under the effect of an incident electromagnetic wave, it can re-radiate the energy in a certain direction through a process called Compton scattering. This is different from reflection, which is a property of bulk electrons in a medium rather than individual particles. Compton scattering can also occur with bound atomic electrons and can result in very high energy photons when combined with a relativistic beam of electrons.
  • #1
Thierry12
25
0
Can someone explain to me how an electron can re-radiate an electromagnetic wave in a certain direction after being under the effect of the incident electromagnectic wave?
 
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  • #2


Look up Compton scattering of photons on free electrons. The cross section at low energies is about 2/3 barn. See
http://en.wikipedia.org/wiki/Compton_scattering

[Edit] Laser (visible) photons can be scattered off of a relativistic beam of electrons and create VERY high energy photons.
 
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  • #3


Compton scattering is not reflection.

It is easiest to see reflection as a property of bulk electrons (for instance, as in a metal) rather than single ones.
 
  • #4


Vanadium 50 said:
Compton scattering is not reflection. It is easiest to see reflection as a property of bulk electrons (for instance, as in a metal) rather than single ones.
This original statement/question:

"Can someone explain to me how an electron can re-radiate an electromagnetic wave in a certain direction after being under the effect of the incident electromagnectic wave?"

refers to "an electron" and "re-radiating" rather than "bulk electrons" and "reflecting". But it could also refer to bound atomic electrons and Rayleigh scattering as well as Compton scattering.
 
  • #5


The title says "reflection", so to answer the OP's question, one should probably point out that reflection is a property of classical waves and media, not individual particles.
 

FAQ: How an electron can re-radiate an electromagnetic wave

What is an electron?

An electron is a subatomic particle that carries a negative charge and is a fundamental component of matter. It is one of the building blocks of atoms and can exist in different energy levels orbiting the nucleus of an atom.

How does an electron re-radiate an electromagnetic wave?

An electron re-radiates an electromagnetic wave when it absorbs energy from an external source, such as an incoming electromagnetic wave, and then releases this energy by emitting a new electromagnetic wave with the same frequency and polarization.

What is the role of electrons in the propagation of electromagnetic waves?

Electrons play a crucial role in the propagation of electromagnetic waves as they are responsible for absorbing and emitting energy, which allows the wave to travel through space. Without the re-radiation of electrons, electromagnetic waves would not be able to travel long distances.

Can all electrons re-radiate electromagnetic waves?

No, not all electrons have the ability to re-radiate electromagnetic waves. Only electrons that are in an excited state, meaning they have absorbed energy, can release this energy in the form of electromagnetic radiation.

What factors influence the re-radiation of electromagnetic waves by electrons?

The re-radiation of electromagnetic waves by electrons is influenced by several factors, including the energy level of the electron, the type of material the electron is in, and the strength and frequency of the external electromagnetic wave.

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