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Raman Microscopy, using a green 514 nm laser is used to probe a sample. |
Raman Spectroscopy coupled with
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The combination of Raman spectroscopy with optical microscopy extends the capabilities of Raman to allow sampling of 1 mm spot sizes. This makes Raman microscopy a very powerful technique for analysis of individual pigment particles. Raman can also provide information about inorganic and organic components in the same analysis. Raman has also been used successfully to differentiate crystalline phases and polymorphs. For example it is possible to identify and classify titanium dioxide phases as anatase or rutile, a analysis that can be critical to determining a date of a painting. |
Raman Applications·Individual pigment particle analysis, in situ for some samples·Polymorph and phase identification·Ability to perform an analysis through glass—allows PLM preparations to be analyzed without removal of particles·Gemstones can be analyzed and identified.·Ink comparisons on questioned documents |
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Crystalline Phases of TiO2 |
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Raman Microscopy |
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Center for Art Materials Analysis, Inc. |
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Raman spectrum of garnet gemstone |
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