Computer Science – Performance
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..359f&link_type=abstract
LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p
Computer Science
Performance
1
X- And Gamma-Ray Sources, Mirrors, Gratings, And Detectors, Superconducting Optical, X-Ray, And Gamma-Ray Detectors, X-Ray Emission Spectra And Fluorescence, Electron, Neutron And X-Ray Diffraction And Scattering
Scientific paper
Fluorescence-detected x-ray absorption spectroscopy probes the fine structure of electronic energy levels with sub-eV resolution by scanning a monochromatic synchrotron beam through the corresponding absorption edge and measuring the intensity of the resulting x-ray fluorescence. For dilute samples, grating spectrometers lack the detection efficiency and conventional Si(Li) or Ge detectors often lack the energy resolution to separate the weak fluorescence signal from strong nearby emission lines. We have built a high-resolution, high-efficiency cryogenic detector system for synchrotron-based soft x-ray spectroscopy. The sensor is a 3×3 array of 200 μm×200 μm superconducting Nb-Al-AlOx-Al-Nb tunnel junctions with an energy resolution of ~15 eV below 1 keV and a total count rate capability of ~100,000 counts/second. This sensor array is cooled to below 0.4 K by a two-stage adiabatic demagnetization refrigerator while held at the end of a 40-cm-long cold finger that can be inserted into a UHV sample chamber for x-ray fluorescence measurements. We present absorption spectra of dilute compounds (~1000 ppm) and will discuss spectrometer performance with respect to the analysis of metalloproteins. .
Cramer Stephen P.
Cunningham Mark F.
Drury O.
Frank Michael
Friedrich Stefan
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