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• W32418170 abstract "FIR spectroscopy is an alternative way of collecting spectra of many inorganic pigmentsand corrosion products found on art objects, which is not normally observed in the MIR region.Most FIR spectra are traditionally collected in transmission mode but as a real novelty it is nowalso possible to record FIR spectra in ATR (Attenuated Total Reflectance) mode. In FIRtransmission we employ polyethylene (PE) for preparation of pellets by embedding the samplein PE. Unfortunately, the preparation requires heating of the PE in order to produces attransparent pellet. This will affect compounds with low melting points, especially those withstructurally incorporated water. Another option in FIR transmission is the use of thin films. Wetest the use of polyethylene thin film (PETF), both commercial and laboratory-made PETF.ATR collection of samples is possible in both the MIR and FIR region on solid, powdery orliquid samples. Changing from the MIR to the FIR region is easy as it simply requires thechange of detector and beamsplitter (which can be performed within a few minutes). Nopreparation of the sample is necessary, which is a huge advantage over the PE transmissionmethod. The most obvious difference, when comparing transmission with ATR, is thedistortion of band shape (which appears asymmetrical in the lower wavenumber region) andintensity differences. However, the biggest difference can be the shift of strong absorbing bandsmoving to lower wavenumbers in ATR mode. The sometimes huge band shift necessitates thecollection of standard library spectra in both FIR transmission and ATR modes, provided thesetwo methods of collecting are to be employed for analyses of unknown samples. Standardsamples of 150 pigment and corrosion compounds are thus collected in both FIR transmissionand ATR mode in order to build up a digital library of spectra for comparison with unknownsamples. XRD, XRF and Raman spectroscopy assists us in confirming the purity or impurity ofour standard samples. 24 didactic test tables, with known pigment and binder painted on thesurface of a limestone tablet, are used for testing the established library and different ways ofcollecting in ATR and transmission mode. In ATR, micro samples are scratched from thesurface and examined in both the MIR and FIR region. Additionally, direct surface contact ofthe didactic tablets with the ATR crystal are tested together with water enhanced surfacecontact. In FIR transmission we compare the powder from our test tablet on the laboratoryPETF and embedded in PE. We also compare the PE pellets collected using a 4x beamcondenser, focusing the IR beam area from 8 mm to 2 mm. A few samples collected from amural painting in a Nepalese temple, corrosion products collected from archaeological Chinesebronze objects and samples from a mural paintings in an Italian abbey, are examined by ATRor transmission spectroscopy." @default.
• W32418170 created "2016-06-24" @default.
• W32418170 creator A5041156710 @default.
• W32418170 date "2009-10-12" @default.
• W32418170 modified "2023-09-28" @default.
• W32418170 title "Transmission and Reflection (ATR) Far-Infrared Spectroscopy Applied in the Analysis of Cultural Heritage Materials" @default.
• W32418170 doi "https://doi.org/10.6092/unibo/amsdottorato/2266" @default.
• W32418170 hasPublicationYear "2009" @default.
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