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Re: Photon Question
Yah, Will is looking at a very low energy case.
Any interaction between any two molecules with sufficient energy will produce something. Now, if the total amount of kinetic energy remains the same in the particles and no mass is lost, then no light is created (in any part of the spectrum).
Most light is created when an excited electron changes between two orbitals (states). The collision may excite an electron which then quickly gives up its new found energy and that would result in light being produced, however, it would also result in a change of total energy of the two molecules that colided so as to conserve the laws of physics.
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