NDLI: Direct tomography imaging for inelastic X-ray scattering experiments at high pressure.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sahle, Ch J. Rosa, A. D. Rossi, M. Cerantola, V. Spiekermann, G. Petitgirard, S. Jacobs, J. Huotari, S. Moretti Sala, M. Mirone, A.
Description	Country affiliation: France Author Affiliation: Sahle CJ ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Rosa AD ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Rossi M ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Cerantola V ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Spiekermann G ( Institute of Earth and Environmental Science, Universität Potsdam, Potsdam, Germany.); Petitgirard S ( Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany.); Jacobs J ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Huotari S ( Department of Physics, POB 64, FI-00014, University of Helsinki, Helsinki, Finland.); Moretti Sala M ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.); Mirone A ( European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France.)
Abstract	A method to separate the non-resonant inelastic X-ray scattering signal of a micro-metric sample contained inside a diamond anvil cell (DAC) from the signal originating from the high-pressure sample environment is described. Especially for high-pressure experiments, the parasitic signal originating from the diamond anvils, the gasket and/or the pressure medium can easily obscure the sample signal or even render the experiment impossible. Another severe complication for high-pressure non-resonant inelastic X-ray measurements, such as X-ray Raman scattering spectroscopy, can be the proximity of the desired sample edge energy to an absorption edge energy of elements constituting the DAC. It is shown that recording the scattered signal in a spatially resolved manner allows these problems to be overcome by separating the sample signal from the spurious scattering of the DAC without constraints on the solid angle of detection. Furthermore, simple machine learning algorithms facilitate finding the corresponding detector pixels that record the sample signal. The outlined experimental technique and data analysis approach are demonstrated by presenting spectra of the Si L -edge and O K-edge of compressed -quartz. The spectra are of unprecedented quality and both the O K-edge and the Si L -edge clearly show the existence of a pressure-induced phase transition between 10 and 24âGPa.
File Format	HTM / HTML
ISSN	09090495
Issue Number	Pt 1
Journal	Journal of Synchrotron Radiation
Volume Number	24
e-ISSN	16005775
Language	English
Publisher	IUCr
Publisher Date	2017-01-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Radiology
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Instrumentation Radiation

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