Abstract
We have recently reported1 the first determination of Ka X-ray linewidths by Ge(Li) spectroscopy. Prior linewidth data, all from crystal diffraction spectroscopy, have been fitted as a function of Z by Salem and Lee2; Krause and Oliver3 point to systematic smooth deviations of these fits from their semi-empirical linewidths based upon the relaxed RHF radiative rates of Scofield4. Our results, for 70 ≤ Z ≤ 82, did not exhibit similar discrepancies, and our Kα3/Kα1 ratios agreed with Scofield’s to within 1%. Our fits to Kα1,2 doublets revealed the presence of the weak l-forbidden Kα3 line. With the aim of determining the Kα3/Kα1 ratio we have refined both our measuring and fitting techniques, as described here.
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