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Low energy photon  electron collision 
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#1
Jul2111, 05:53 PM

P: 9

Suppose a photon collides with an electron, but does not have enough energy to dislodge the electron or knock the electron into it's next energy level. What happens? Is the effect observed?



#2
Jul2211, 01:39 AM

P: 355

Nothing happens. The probability that an electron exists between energy levels is zero, so the probability that it will absorb that level of energy is zero.



#3
Jul2211, 02:01 AM

P: 3,014

The photon will scatter off from its initial direction, transferring a little momentum and kinetic energy to the atom as a whole and losing a little bit of energy, thus becoming redshifted. It is like the Compton scattering, only that instead of the mass of a free electron, you should use the mass of the atom.



#4
Jul2211, 03:38 AM

P: 33

Low energy photon  electron collision
I believe this is what happens in transparent objects



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