Absolute determination of the X‐ray absorption coefficient of barium in the L region using a liquid absorption cell |
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| Authors: | Alojz Kodre Jana Padežnik Gomilšek Robert Hauko Martin Šala Iztok Arčon |
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| Affiliation: | 1. Faculty of Mathematics and Physics, University of Ljubljana, , SI‐1000 Ljubljana, Slovenia;2. J. Stefan Institute, , SI‐1000 Ljubljana, Slovenia;3. Faculty of Mechanical Engineering, University of Maribor, , SI‐2000 Maribor, Slovenia;4. National Institute of Chemistry, , SI‐1000 Ljubljana, Slovenia;5. University of Nova Gorica, , SI‐5000 Nova Gorica, Slovenia;6. Centre of Excellence Low‐Carbon Technologies (CO NOT), , SI‐1000 Ljubljana, Slovenia |
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| Abstract: | A method of absolute measurement of X‐ray absorption coefficient is proposed, on the basis of the use of an adjustable pathlength liquid cell and a solution of the investigated element. A variational analysis of the measured data is developed to remove some sources of systematic error. A check of the exponential attenuation with thickness is used to suppress beam harmonics admixture and dark current drifts. The method is illustrated by a measurement on Ba in the L edge region, using aqueous solution of Ba nitrate. Measured data provide information on detailed energy dependence of the absorption beyond the Victoreen‐like trends reproduced in compilations. The proposed method provides a way to measure the absorption data for practically all elements and a wide range of photon energies. Copyright © 2012 John Wiley & Sons, Ltd. |
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