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In the present talk the basics of the Raman spectroscopy and particularly of Raman microscopy are explained. Advantages and disadvantages of the method are highlighted through selected case studies. In the second part of the lecture examples of correlative imaging with electron, X-ray, ion and optical microscopies from micro- to the nanoscale are highlighted.
Raman microspectroscopy enables imaging of the distributions of mineral phases as well as physical properties of materials, such as crystal orientations and crystallinities, with down to sub-micrometre resolution. In a combination with other spectroscopic and microscopic techniques, this approach was applied to the analysis and elucidation of ancient production technologies of stucco fragments made of high-fired gypsum mortar and Egyptian blue pigment discovered on a monochrome wall painting fragment originating from the Early Medieval (5th/6th century AD) construction phase of the church St. Peter above Gratsch in South Tyrol (Northern Italy).
Research in the SALSA Application Lab – Shedding light onto high-fired medieval gypsum mortars
(2019)
After an introduction into the SALSA lab building and the ideas and sources of inspiration for building up the Application Lab as a spectroscopy lab with a strong focus on imaging and microspectroscopy, a very successful example of an interdisciplinary collaboration between the fields of art technology and analytical sciences is presented.
Raman band widths of anhydrite II reveal the burning history of high‐fired medieval gypsum mortars
(2019)
An interdisciplinary collaboration between art technology and analytical sciences yielded an approach based on Raman microspectroscopy for the determination of the burning temperatures applied during the production process of high-fired medieval gypsum mortars. Analytical challenges and applications of the approach to examples from the cultural heritage of South Tyrol are presented.