J W Fowler, G C O'Neil, B K Alpert, D A Bennett, E V Denison, W B Doriese, G C Hilton, L T Hudson, Y-I Joe, K M Morgan, D R Schmidt, D S Swetz, C I Szabo, J N Ullom
We use an array of transition-edge sensors, cryogenic microcalorimeters with 4 eV energy resolution, to measure L x-ray emission-line profiles of four elements of the lanthanide series: praseodymium, neodymium, terbium, and holmium. The spectrometer also surveys numerous x-ray standards in order to establish an absolute-energy calibration traceable to the international system of units for the energy range 4 keV to 10 keV. The new results include emission line profiles for 97 lines, each expressed as a sum of one or more Voigt functions; improved absolute energy uncertainty on 71 of these lines relative to existing reference data; a median uncertainty on the peak energy of 0...
February 2021: Metrologia