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- Thread starter nlsherrill
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More formally, the scattering matrix element between two plane-wave states is non-zero. The square of the modulus, multiplied by the available phase space around the final state, gives the scattering cross section.

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Thanks for the quick reply! So essentially all comes down to the uncertainty principle? I understand classical scattering and understood the connection you made to an impact parameter.

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The kinematics requires conservation of energy, and conservation of momentum in both longitudinal and transverse planes (3 unknowns, and 3 equations total). This is very similar to billiard ball kinematics.

See Section 4 in http://farside.ph.utexas.edu/teaching/em/lectures/node92.html for a discussion of Thomson scattering.

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