re:Photon hits an atom

From: Doodedski (billybilly54321_at_hotmail-dot-com.no-spam.invalid)
Date: 11/15/04 

Date: 14 Nov 2004 18:28:20 -0600

Thanks for the info.

> When a photon of energy less than the smallest gap allowed hits
> the electron, the electron does not jump, but simply oscillates
> more strongly on its orbital. That kinetic energy may be transfered

> to the atom. That's how radiant heat (infrared) is absorbed.
>

I really didn't think that was possible. I thought the photon had to
match the gap to excite the electron. This really clears up things
and clearly, my friend was right and I was wrong.

> There also are cases when only part of the energy of an incoming
> photon is absorbed. Regarding this, read on Compton scattering
> and Raman scattering.
>

I've studied the compton effect but this was with a free electron so
his energy levels were not limited. As for Raman scattering, I
remember doing an experiment on the subject. My teacher had
explained it by saying that the photon was hitting a trampoline (
crystal lattice vibrating) and the energy of the scattered photon
depended on when the photon hit the trampoline (absorbing or emitting
a phonon). This image is pretty clear but I am just not sure about
what is really going on. Isn't the photon simply being absorbed by
an electron (with limited energy levels) and than reemitted. How is
the vibration affecting this process?
Thanks,
Doodedski

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