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Title: Diamond sensors and polycapillary lenses for X-ray absorption spectroscopy

Diamond sensors are evaluated as incident beam monitors for X-ray absorption spectroscopy experiments. These single crystal devices pose a challenge for an energy-scanning experiment using hard X-rays due to the effect of diffraction from the crystalline sensor at energies which meet the Bragg condition. This problem is eliminated by combination with polycapillary lenses. The convergence angle of the beam exiting the lens is large compared to rocking curve widths of the diamond. A ray exiting one capillary from the lens meets the Bragg condition for any reflection at a different energy from the rays exiting adjacent capillaries. This serves to broaden each diffraction peak over a wide energy range, allowing linear measurement of incident intensity over the range of the energy scan. Extended X-ray absorption fine structure data are measured with a combination of a polycapillary lens and a diamond incident beam monitor. These data are of comparable quality to data measured without a lens and with an ionization chamber monitoring the incident beam intensity.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  2. Photon Sciences Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
  3. Center for Synchrotron Biosciences, Case Western Reserve University, Cleveland, Ohio 44106 (United States)
  4. Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11974-3800 (United States)
  5. Instrumentation Division, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
Publication Date:
OSTI Identifier:
22220378
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ABSORPTION SPECTROSCOPY; ACCIDENTS; BEAM MONITORS; COMPARATIVE EVALUATIONS; DIAMONDS; HARD X RADIATION; IONIZATION CHAMBERS; LENSES; MONOCRYSTALS; NEUTRON DIFFRACTION; SENSORS; X-RAY DETECTION; X-RAY SPECTRA; X-RAY SPECTROSCOPY