STUDIES BY MEANS OF SYNCHROTRON RADIATION

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dc.contributor.authorOLADIPO, OMOTOLA AFOLAYAN
dc.date.accessioned2014-02-11T11:56:16Z
dc.date.available2014-02-11T11:56:16Z
dc.date.issued1984-10
dc.descriptionA Dissertation presented to THE FACULTY OF TECHNOLOGYen_US
dc.description.abstractExtended X-ray Absorption Fine Structure [EXAFS) has become known in recent years as a technique for studying the environment of specific elements in chemical systems. This has been related to the advent of synchrotron radiation. The significance of the present studies is to find out how to calculate the EXAFS spectra of our samples, otherwise called "model compounds" (standards or calibrants) viz: potassium bromide - KBr; manganese( II) ammonium sulphate hexahydrate - MnSOJNH ) SO .6H O; and strontium bromide hexahydrate - SrBr2.6H O; from the information available to us from their crystal structures. The EXAFS data for the samples were obtained from the Daresbury Synchrotron Radiation Source and analysed via appropriate UMIST computer programmes. We have assumed that the scattering factors from the Daresbury MUFPOT programme as used in our calculations in the EXAFS region beyond - 70 eV are reliable. The first objective of the work involved carrying out calculations in the EXAFS regime termed "short-range" refinements for convenience. The second objective investigated the possibility of extending these calculations to the inner region called XANES (X-ray Absorption Near Edge Structure). Although these calculations gave a fit in the EXAFS region, the f i t in the inner region was not satisfactory. The final objective was to attempt to modify the scattering factors in the XANES regime and termed "long-range" refinements. The computer programme involved employed curve f i t t i ng by Least Squares, and Fourier transformation techniques. The attempts to modify the scattering factors in the XANES region were largely successful and the results obtained from these studies will be of use in refinements determining unknown structures of compounds with similar atoms to those in the present investigation.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1241
dc.language.isoenen_US
dc.subjectSYNCHROTRONen_US
dc.subjectRADIATIONen_US
dc.titleSTUDIES BY MEANS OF SYNCHROTRON RADIATIONen_US
dc.typeThesisen_US
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