title: Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy.
abstract: Using X-ray absorption near edge structure (XANES) spectroscopy, information on the local chemical structure and oxidation state of an element of interest can be acquired. Conventionally, this information can be obtained in a spatially resolved manner by scanning a sample through a focused X-ray beam. Recently, full-field methods have been developed to obtain direct 2D chemical state information by imaging a large sample area. These methods are usually in transmission mode, thus restricting the use to thin and transmitting samples. Here, a fluorescence method is displayed using an energy-dispersive pnCCD detector, the SLcam, characterized by measurement times far superior to what is generally applicable. Additionally, this method operates in confocal mode, thus providing direct 3D spatially resolved chemical state information from a selected subvolume of a sample, without the need of rotating a sample. The method is applied to two samples: a gold-supported magnesia catalyst (Au/MgO) and a natural diamond containing Fe-rich inclusions. Both samples provide XANES spectra that can be overlapped with reference XANES spectra, allowing this method to be used for fingerprinting and linear combination analysis of known XANES reference compounds.
authors.affiliation: XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium.
authors.forename: Pieter
authors.identifier: 0000-0001-8437-6678
authors.initials: P
authors.lastname: Tack
authors.affiliation: XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium.
authors.forename: Bart
authors.initials: B
authors.lastname: Vekemans
authors.affiliation: XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium.
authors.forename: Brecht
authors.initials: B
authors.lastname: Laforce
authors.affiliation: Geoscience Institute-Mineralogy, Goethe University , Altenhöferallee 1, 60438 Frankfurt, Germany.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Rudloff-Grund
authors.affiliation: Comoc, Department of Inorganic and Physical Chemistry, Ghent University , Krijgslaan 281 S3, 9000 Ghent, Belgium.
authors.forename: Willinton Y
authors.initials: WY
authors.lastname: Hernández
authors.affiliation: Deutsch Elektronen Synchrotron DESY, Photon Science , Notkestr 85, D-22603 Hamburg, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Garrevoet
authors.affiliation: Deutsch Elektronen Synchrotron DESY, Photon Science , Notkestr 85, D-22603 Hamburg, Germany.
authors.forename: Gerald
authors.initials: G
authors.lastname: Falkenberg
authors.affiliation: Geoscience Institute-Mineralogy, Goethe University , Altenhöferallee 1, 60438 Frankfurt, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Brenker
authors.affiliation: Comoc, Department of Inorganic and Physical Chemistry, Ghent University , Krijgslaan 281 S3, 9000 Ghent, Belgium.
authors.forename: Pascal
authors.initials: P
authors.lastname: Van Der Voort
authors.affiliation: XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium.
authors.forename: Laszlo
authors.initials: L
authors.lastname: Vincze