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We have measured the bremsstrahlung yield at 6.2^∘{} in the reaction e^-+C→e^-+C+γ using incident-electron energies up to 9.5 GeV. The data confirm the predictions of quantum electrodynamics for timelike electron four-momenta up to 1 GeV.
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Siemann et al. (1969) studied this question.
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