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We introduce a new technique for determining x-ray fluorescence line energiesand widths, and we present measurements made with this technique of 22 x-ray Llines from lanthanide-series elements. The technique uses arrays oftransition-edge sensors, microcalorimeters with high energy-resolving powerthat simultaneously observe both calibrated x-ray standards and the x-rayemission lines under study. The uncertainty in absolute line energies isgenerally less than 0.4 eV in the energy range of 4.5 keV to 7.5 keV. Of theseventeen line energies of neodymium, samarium, and holmium, thirteen are foundto be consistent with the available x-ray reference data measured after 1990;only two of the four lines for which reference data predate 1980, however, areconsistent with our results. Five lines of terbium are measured withuncertainties that improve on those of existing data by factors of two or more.These results eliminate a significant discrepancy between measured andcalculated x-ray line energies for the terbium Ll line (5.551 keV). The linewidths are also measured, with uncertainties of 0.6 eV or less on thefull-width at half-maximum in most cases. These measurements were made with anarray of approximately one hundred superconducting x- ray microcalorimeters,each sensitive to an energy band from 1 keV to 8 keV. No energy-dispersivespectrometer has previously been used for absolute-energy estimation at thislevel of accuracy. Future spectrometers, with superior linearity and energyresolution, will allow us to improve on these results and expand themeasurements to more elements and a wider range of line energies.

A Reassessment of Absolute Energies of the X-ray L Lines of Lanthanide Metals