Light: Electron Deflection Q&A

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When an electron is shot into a laser beam, it may not be deflected by the light's oscillating electric and magnetic fields unless the photon energy is sufficiently high. The interaction resembles Compton scattering, where energy transfer occurs through absorption or scattering of the photon by the electron. If the laser frequency is low, the electron is unlikely to scatter unless it is moving at relativistic speeds, which could lead to inverse Compton scattering. The discussion emphasizes that the interaction is not a simple one but rather depends on the energy levels of both the photon and the electron. Overall, the behavior of the electron in the presence of light is complex and influenced by the energy involved.
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This may be a dumb question but if light is an oscillating E and B field, If i shot an electron into to a laser beam will it get deflected by the lights E and B fields. Or is this like Compton scattering.
 
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The electron would have to be deflected because light has momentum.
 
The oscilatting fields are what make up a photon. Any transfer of energy would have to occur because the photon gets absorbed or scattered by the electron, not a simple interaction because of one of the fields.
 
Drakkith said:
The oscilatting fields are what make up a photon. Any transfer of energy would have to occur because the photon gets absorbed or scattered by the electron, not a simple interaction because of one of the fields.

That is energy measured in an orthogonal direction to that of the momentum gained though right?
 
LostConjugate said:
That is energy measured in an orthogonal direction to that of the momentum gained though right?

If that means what I think it means, then yes. The photon would only effect the electron by being absorbed or scattered, which transfers it's momentum to the electron. A photon passing near an electron would not deflect either one.
 
so basically it is Compton scattering
 
Compton scattering is the limiting case where the photon has high energy and can essentially be approximated as a classical particle.

Outside this limit, the EM field will still impart momentum to an electron, but it may be a stretch to say that it obeys the laws of Compton scattering.

Claude.
 
cragar said:
so basically it is Compton scattering

It depends on the frequency of the laser beam. If it is high enough the electron MIGHT get scattered. Otherwise it will not unless it is traveling at relativistic speeds. In which case it could undergo inverse compton scattering.

If the electron and the photons are not of sufficient energy, then I don't think the electron will be scattered. I don't know too much on the subject so someone else may need to clarify that.
 
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