NDLI: Sample thickness and quantitative concentration measurements in Br K-edge XANES spectroscopy of organic materials.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Leri, Alessandra C. Ravel, Bruce
Description	Country affiliation: United States Author Affiliation: Leri AC ( Department of Natural Sciences, Marymount Manhattan College, 221 E 71st Street, New York, NY 10021, USA.); Ravel B ( National Institute of Standards and Technology, 100 Bureau Drive, MS 8370, Gaithersburg, MD 20899, USA.)
Abstract	While XANES spectroscopy is an established tool for quantitative information on chemical structure and speciation, elemental concentrations are generally quantified by other methods. The edge step in XANES spectra represents the absolute amount of the measured element in the sample, but matrix effects and sample thickness complicate the extraction of accurate concentrations from XANES measurements, particularly at hard X-ray energies where the X-ray beam penetrates deeply into the sample. The present study demonstrates a method of quantifying concentration with a detection limit approaching 1 mg kg(-1) using information routinely collected in the course of a hard X-ray XANES experiment. The XANES normalization procedure unambiguously separates the signal of the absorber from any source of background. The effects of sample thickness on edge steps at the bromine K-edge were assessed and an empirical correction factor for use with samples of variable mass developed.
File Format	HTM / HTML
ISSN	09090495
Issue Number	Pt 3
Journal	Journal of Synchrotron Radiation
Volume Number	21
e-ISSN	16005775
Language	English
Publisher	IUCr
Publisher Date	2014-05-01
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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