Inelastic x-ray scattering at intermediate momentum transfer: Fluorescence spectrum and search for infrared divergence in scattered x-ray spectra

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Abstract
We have measured the ratio of the fluorescence line intensities in the decay of a copper K-shell vacancy created in an inelastic-scattering event at intermediate momentum transfer. The measured value of the ratio of Kβ line intensity to Kα line intensity is 0.07±0.05, consistent with the value observed for excitation by photoabsorption. We also present data on the spectrum of x rays inelastically scattered from the copper K shell in a search for the predicted infrared divergence in the atomic scattering cross section. We find that the observed spectrum at low scattered x-ray energy in this and previous work is well described by secondary x rays produced in bremsstrahlung emission by photoelectrons.