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# frequency shift in Compton scattering

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How would one obtain the Compton shift equation if the incident photon and electron were moving in opposite directions to begin with?

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A detailed solution is given. Frequency shifts in compton scattering is examined. The incident photon and electrons were moving in opposite directions are analyzed.

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I would recommend you to do these computations using four-vector algebra, not using the manipulations in the notes (that's very messy and you only have to make one mistake somewhere to get stuck). Let me explain a bit. You know that time and space transform according to Lorentz transformations. If you are at rest and I move relative to you in the x-direction with velocity v and we have synchronized or clocks t = t' = 0 when I was at x = 0 we have:

x' = gamma (x-vt)

t' = gamma (t - v x/c^2)

where x and t are the space time-coordinates of some event in your frame and x' and t' are the space time-coordinates of that same event in my frame. You can combine space and time in a four-vector like (ct,x,y,z). It turns out that you can also combine energy and momentum in a four-vector like (E/c, P). This then transforms under Lorentz transformations and we have:

P' = gamma (P - v E/c^2 )

E' = gamma (E - v P )

Here P and P' are just the x components of the momentum in your and my frame respectively.

In case of four vectors, one defines an inner product as follows. Let (a,b) and (r,s) be four-vector with a and r the "zeroth components (e.g. the time component of an event or the energy component of the energy-momentum four-vector), and let b and s be ordinary three-component vectors. Then one ...

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