7 research outputs found
Combining scanning probe microscopy and x-ray spectroscopy
A new versatile tool, combining Shear Force Microscopy and X-Ray Spectroscopy was designed and constructed to obtain simultaneously surface topography and chemical mapping. Using a sharp optical fiber as microscope probe, it is possible to collect locally the visible luminescence of the sample. Results of tests on ZnO and on ZnWO4 thin layers are in perfect agreement with that obtained with other conventional techniques. Twin images obtained by simultaneous acquisition in near field of surface topography and of local visible light emitted by the sample under X-Ray irradiation in synchrotron environment are shown. Replacing the optical fibre by an X-ray capillary, it is possible to collect local X-ray fluorescence of the sample. Preliminary results on Co-Ti sample analysis are presented
X-ray Fluorescence Analysis in an Electron Microscope: Improved Spotsize of Polycapillary Focusing Optics at the IfG Modular X-ray Source (iMOXS/2®)
Discovering Vanished Paints and Naturally Formed Gold Nanoparticles on 2800 Years Old Phoenician Ivories Using SR-FF-MicroXRF with the Color X‑ray Camera
Phoenician
ivory objects (8<sup>th</sup> century B.C., Syria) from
the collections of the Badisches Landesmuseum, Karlsruhe, Germany,
have been studied with full field X-ray fluorescence microimaging,
using synchrotron radiation (SR-FF-microXRF). The innovative Color
X-ray Camera (CXC), a full-field detection device (SLcam), was used
at the X-ray fluorescence beamline of the ANKA synchrotron facility
(ANKA-FLUO, KIT, Karlsruhe, Germany) to noninvasively study trace
metal distributions at the surface of the archeological ivory objects.
The outstanding strength of the imaging technique with the CXC is
the capability to record the full XRF spectrum with a spatial resolution
of 48 μm on a zone of a size of 11.9 × 12.3 mm<sup>2</sup> (264 × 264 pixels). For each analyzed region, 69696 spectra
were simultaneously recorded. The principal elements detected are
P, Ca, and Sr, coming from the ivory material itself; Cu, characteristic
of pigments; Fe and Pb, representing sediments or pigments; Mn, revealing
deposited soil minerals; Ti, indicating restoration processes or correlated
with Fe sediment traces; and Au, linked to a former gilding. This
provides essential information for the assessment of the original
appearance of the ivory carvings. The determined elemental maps specific
of possible pigments are superimposed on one another to visualize
their respective distributions and reconstruct the original polychromy
and gilding. Reliable hypotheses for the reconstruction of the original
polychromy of the carved ivories are postulated on this basis