1. X-ray absorption spectroscopy and related techniquesAlojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, 2004, original scientific article Abstract: In the extensive field of X-ray diagnostic techniques, nowadays mostly implemented on synchrotron X-ray sources, the X-ray absorption methods offer a relatively simple tool for structural analysis of materials. The advantage of the methods is the sensitivity to chemical species and the insensitivity to the long-range order. An overview of various detection techniques is given together with the discussion of accuracy of the method with regard to the spatial resolution and the possible contamination by intra-atomic contributions, the multielectron photoexcitations.
Keywords: X-rays, absorption, EXAFS, XANES
Published in DKUM: 30.08.2017; Views: 991; Downloads: 102
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2. Specific EXAFS tools in analysis of MoSI nanowiresAlojz Kodre, Jana Padežnik Gomilšek, Iztok Arčon, Anton Meden, Dragan Mihailović, 2006, original scientific article Abstract: The structure of nanowires prepared by vapor synthesis from Mo, S and I is investigated by methods of x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS). Starting with a qualitative model of the structure from XRD, the metrics is introduced with interatomic distances determined from EXAFS. Two specific tools to increase the resolution of EXAFS method are discussed: the reciprocity relation between data from adjacent target atoms, and difference EXAFS from data on samples with small changes in stoichiometry.
Keywords: EXAFS, nanowires, molybdenum sulphide-iodide
Published in DKUM: 25.08.2017; Views: 881; Downloads: 148
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3. High-resolution X-ray absorption spectrometry of atomic vaporsAndrej Mihelič, Alojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, 2004, original scientific article Abstract: A measurement of an x-ray absorption spectrum of a monatomic sample yields pure atomic absorption essential for the EXAFS (Extended X-ray Absorption Fine Structure) analysis in cases of a weak structural signal. A construction of an absorption cell to contain vapor sample takes into account specific properties of the investigated element. Metal-vapor absorption cells for the elements K, Zn, Rb, Cd, Cs, and Hg are presented and comments are made on the use of materials and the operating mechanisms of the cells.
Keywords: x-ray absorption, atomic vapors, K, Zn, Rb, Cd, Cs, EXAFS
Published in DKUM: 18.08.2017; Views: 1233; Downloads: 124
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