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Complete question: A scattering between a infrared radiation photon and a microwave photon can be made into a symmetric scattering problem by switching into the center of mass frame?

Quantum-mechanically, there is photon-photon scattering (two-photon physics)

For example a scattering between a microwave photon and an x-ray photon can be made into a symmetric scattering problem by switching into the center of mass frame.

But for other types of radiation, for example between a infrared photon and a microwave photon?

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  • $\begingroup$ What is the center of mass of a system with no massive objects? $\endgroup$ – The Photon Aug 1 at 16:41
  • $\begingroup$ @ThePhoton I guess you know the answer to that. $\endgroup$ – my2cts Aug 1 at 18:42
  • $\begingroup$ @my2cts, I think I know which frame OP wants, but I don't see why it's called the "center of mass" frame. (given we're not supposed to talk about "relativistic mass" any more) $\endgroup$ – The Photon Aug 1 at 18:43
  • $\begingroup$ The center of mass frame is a nonrelativistic approximation to the frame with vanishing momentum. $\endgroup$ – my2cts Aug 1 at 18:50

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