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Laser-Induced Breakdown Spectroscopy for depth-profile analysis of historical painting model samples

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POSPÍŠILOVÁ Eva NOVOTNÝ Karel KAISER Jozef POŘÍZKA Pavel ŠEVČÍK Richard HRADIL David HRADILOVÁ Janka

Rok publikování 2017
Druh Konferenční abstrakty
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Popis Model multilayered painting samples containing traditional pigments were prepared on a wooden support (5 x 10 cm) with each layer partly revealed. Typical model sample consisted of three to four layers, with first, so called ground layer, containing clay or chalk in organic binder, second organic layer, and the third or in some cases fourth layer containing inorganic pigments (e.g. Azurite or Prussian Blue) in organic binder or organic dyes (e.g. Carmine Lake) with inorganic medium in organic binder. Thirty laser pulses were applied to one point and individual spectra were obtained for each shot. Broadband spectra were first acquired using Sci-Trace instrument (AtomTrace, Czech Republic) equipped with echelle spectrometer and EMCCD camera. Significant element lines were chosen and samples were re-measured using modified ablation system New Wave UP-266 MACRO equipped with Czerny Turner monochromator and an ICCD detector. Spectra obtained using both LIBS systems were processed to create the depth profiles of the samples. Particular element lines representing each layer (e.g. Cu I 324.7 nm for Azurite) were chosen. Acoustic and total emission signal was used for elimination of drift caused by the strong shot-to-shot LIBS signal variations and changes in physical–chemical properties of different layers. For comparison purposes elemental analysis by hand-held X-ray fluorescence spectrometer Innov-X DELTA Premium was used. The advantages and limitations of LIBS and hand-held XRF are discussed.
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