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Title: High quality x-ray absorption spectroscopy measurements with long energy range at high pressure using diamond anvil cell

Abstract

We describe an approach for acquiring high quality x-ray absorption fine structure (XAFS) spectroscopy spectra with wide energy range at high pressure using diamond anvil cell (DAC). Overcoming the serious interference of diamond Bragg peaks is essential for combining XAFS and DAC techniques in high pressure research, yet an effective method to obtain accurate XAFS spectrum free from DAC induced glitches has been lacking. It was found that these glitches, whose energy positions are very sensitive to the relative orientation between DAC and incident x-ray beam, can be effectively eliminated using an iterative algorithm based on repeated measurements over a small angular range of DAC orientation, e.g., within {+-}3{sup o} relative to the x-ray beam direction. Demonstration XAFS spectra are reported for rutile-type GeO{sub 2} recorded by traditional ambient pressure and high pressure DAC methods, showing similar quality at 440 eV above the absorption edge. Accurate XAFS spectra of GeO{sub 2} glass were obtained at high pressure up to 53 GPa, providing important insight into the structural polymorphism of GeO{sub 2} glass at high pressure. This method is expected be applicable for in situ XAFS measurements using a diamond anvil cell up to ultrahigh pressures.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1005765
Resource Type:
Journal Article
Resource Relation:
Journal Name: Rev. Sci. Instrum.; Journal Volume: 80; Journal Issue: (7) ; 07, 2009
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; BRAGG CURVE; ENERGY RANGE; ORIENTATION; X-RAY SPECTROSCOPY; ALGORITHMS; GERMANIUM OXIDES; PRESSURE RANGE GIGA PA

Citation Formats

Hong, X., Newville, M., Prakapenka, V.B., Rivers, M.L., Sutton, S.R., Cornell CHESS), and UC). High quality x-ray absorption spectroscopy measurements with long energy range at high pressure using diamond anvil cell. United States: N. p., 2009. Web. doi:10.1063/1.3186736.
Hong, X., Newville, M., Prakapenka, V.B., Rivers, M.L., Sutton, S.R., Cornell CHESS), & UC). High quality x-ray absorption spectroscopy measurements with long energy range at high pressure using diamond anvil cell. United States. doi:10.1063/1.3186736.
Hong, X., Newville, M., Prakapenka, V.B., Rivers, M.L., Sutton, S.R., Cornell CHESS), and UC). Fri . "High quality x-ray absorption spectroscopy measurements with long energy range at high pressure using diamond anvil cell". United States. doi:10.1063/1.3186736.
@article{osti_1005765,
title = {High quality x-ray absorption spectroscopy measurements with long energy range at high pressure using diamond anvil cell},
author = {Hong, X. and Newville, M. and Prakapenka, V.B. and Rivers, M.L. and Sutton, S.R. and Cornell CHESS) and UC)},
abstractNote = {We describe an approach for acquiring high quality x-ray absorption fine structure (XAFS) spectroscopy spectra with wide energy range at high pressure using diamond anvil cell (DAC). Overcoming the serious interference of diamond Bragg peaks is essential for combining XAFS and DAC techniques in high pressure research, yet an effective method to obtain accurate XAFS spectrum free from DAC induced glitches has been lacking. It was found that these glitches, whose energy positions are very sensitive to the relative orientation between DAC and incident x-ray beam, can be effectively eliminated using an iterative algorithm based on repeated measurements over a small angular range of DAC orientation, e.g., within {+-}3{sup o} relative to the x-ray beam direction. Demonstration XAFS spectra are reported for rutile-type GeO{sub 2} recorded by traditional ambient pressure and high pressure DAC methods, showing similar quality at 440 eV above the absorption edge. Accurate XAFS spectra of GeO{sub 2} glass were obtained at high pressure up to 53 GPa, providing important insight into the structural polymorphism of GeO{sub 2} glass at high pressure. This method is expected be applicable for in situ XAFS measurements using a diamond anvil cell up to ultrahigh pressures.},
doi = {10.1063/1.3186736},
journal = {Rev. Sci. Instrum.},
number = (7) ; 07, 2009,
volume = 80,
place = {United States},
year = {Fri Jul 31 00:00:00 EDT 2009},
month = {Fri Jul 31 00:00:00 EDT 2009}
}