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Title: High x-ray resolving power utilizing asymmetric diffraction from a quartz transmission crystal measured in the 6 keV to 22 keV energy range

Journal Article · · Applied Optics
 [1];  [2];  [1];  [1];  [3]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Artep Inc., Ellicott City, MD (United States)
+ Show Author Affiliations

We report a Cauchois-type spectrometer utilizing the (203) lattice planes at an oblique angle of 11.53° to the normal to the surface of a quartz transmission crystal recorded the Kα and Kβ spectral lines of six elements from Fe to Ag in the 6–22 keV energy range from a laboratory x-ray source. After deconvolving the natural lifetime widths and the image plate detector broadening from the observed spectral linewidths, the intrinsic crystal resolving power was determined to be 4000 at the lower energies and decreasing to 1000 at the higher energies. Previously, a Si wafer crystal exhibited twice this resolving power when the (331) planes had been used in asymmetric geometry. The investigation of diffraction with this quartz crystal, with a very similar lattice spacing and therefore spectral coverage, was motivated by the larger integrated reflectivity of quartz due to its well-known quasimosaicity upon elastic bending. The measured spectral linewidths were in good agreement with the widths calculated by accounting for various broadening mechanisms, including source size, crystal thickness, crystal height, crystal rocking curve width, geometrical aberrations, and possible spectrometer configuration errors. This is the first, to the best of our knowledge, demonstration of high resolving power achieved by asymmetric diffraction over a wide energy range (6–22 keV) and with detailed comparisons with theoretical broadenings. Finally, based on these results, Cauchois spectrometers employing asymmetric planes of perfect quartz and silicon crystals can be reliably designed and optimized for high-resolution spectroscopy in the >6 keV energy range.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-76SF00515; SF00515
OSTI ID:
1546963
Alternate ID(s):
OSTI ID: 1529437
Journal Information:
Applied Optics, Vol. 58, Issue 19; ISSN 1559-128X
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (10)

X-ray transition energies: new approach to a comprehensive evaluation journal January 2003
Widths of the Atomic k–n7 Levels journal January 2001
Grain size dependence of elastic anomalies accompanying the α–β phase transition in polycrystalline quartz journal January 2008
K α 1 , 2 and K β 1 , 3 x-ray emission lines of the 3 d transition metals journal December 1997
X-ray spectrometer having 12 000 resolving power at 8 keV energy journal October 2017
Tunable hard X-ray spectrometer utilizing asymmetric planes of a quartz transmission crystal journal May 2016
Enhanced x-ray resolving power achieved behind the focal circles of Cauchois spectrometers journal January 2008
XOP v2.4: recent developments of the x-ray optics software toolkit conference September 2011
X-ray spectrometry of copper: New results on an old subject journal January 2004
X-ray spectrometry of copper: New results on an old subject journal January 2004

Figures / Tables (11)

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Table 3(p. 5)table Table 3
Fig. 7(p. 6)figure Fig. 7
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