Title :
A 36-Pixel Tunnel Junction Soft X-Ray Spectrometer for Scintillator Material Science
Author :
Friedrich, Stephan ; Drury, Owen B. ; Yuan, Shaopang ; Szupryczynski, Piotr ; Spurrier, Merry A. ; Melcher, Charles L.
Author_Institution :
Lawrence Livermore Nat. Lab., Livermore
fDate :
6/1/2007 12:00:00 AM
Abstract :
We have built a 36-pixel superconducting tunnel junction (STJ) spectrometer for high-resolution soft X-ray spectroscopy at the synchrotron. It has an energy resolution between ~10 and ~20 eV FWHM for X-ray energies below ~1 keV, and can be operated at maximum total count rates of ~106 counts/s. For increased sensitivity, we have modified the detector cold finger the so that the array now subtends a solid angle of Omega/4pi ap0.1%. The spectrometer is currently used at the Advanced Light Source synchrotron for speciation measurements of dilute samples by fluorescence-detected X-ray absorption spectroscopy. We present measurements of the oxidation state of dilute cerium activators in novel scintillator materials, determine the Ce3+/Ce4+ ratio, and discuss the sensitivity of the instrument for quantitative speciation measurements.
Keywords :
X-ray spectrometers; X-ray spectroscopy; materials science; scintillation; synchrotrons; 36-pixel superconducting tunnel junction spectrometer high-resolution soft X-ray spectroscopy; 36-pixel tunnel junction soft X-ray spectrometer; advanced light source synchrotron; fluorescence-detected X-ray absorption spectroscopy; scintillator material science; Detectors; Energy resolution; Fingers; Josephson junctions; Light sources; Materials science and technology; Sensor arrays; Solids; Spectroscopy; Synchrotrons; Cerium activators; X-ray absorption spectroscopy; oxidation states; superconducting X-ray detectors; superconducting tunnel junctions;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898725
