Accurate measurement of Mg and Al Kα1,2 X-ray energy profiles

Abstract We have obtained new, accurate, high-resolution measurements of the energy distribution of Kα1,2 X-rays emitted in fluorescence from Mg and from Al. The energy profiles were obtained by measuring their Bragg diffraction with a double flat-crystal spectrometer equipped with accurate angle encoders. Both potassium dihydrogen phosphate and ammonium dihydrogen phosphate crystals were used to check the index-of-refraction correction to Bragg diffraction, the largest source of uncertainly in this measurement. Through the use of Cu Kα1 as a transfer standard, these X-ray energies (or wavelengths) have been connected with the optical wavelength scale, and thus to the Rydberg constant R∞. Separate Kα1 and Kα2 energies as well as the centroids and maxima of the Kα1,2 distributions are given for both Mg and Al: separate Kα1 and Kα2 energies for Mg are presented here for the first time. Resulting uncertainty estimates are in the range 0.01–0.015 eV.

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