Abstract
A recently developed micrometer-scale spatially offset Raman spectroscopy (μ-SORS) method provides a new analytical capability for investigating non-destructively the chemical composition of sub-surface, micrometer-scale thickness, diffusely scattering layers at depths beyond the reach of conventional confocal Raman microscopy. Here, we demonstrate experimentally, for the first time, the capability of μ-SORS to determine whether two detected chemical components originate from two separate layers or whether the two components are mixed together in a single layer. Such information is important in a number of areas, including conservation of cultural heritage objects, and is not available, for highly turbid media, from conventional Raman microscopy, where axial (confocal) scanning is not possible due to an inability to facilitate direct imaging within the highly scattering sample. This application constitutes an additional capability for μ-SORS in addition to its basic capacity to determine the overall chemical make-up of layers in a turbid system.
Highlights
The recently developed technique of defocused micrometer-scale spatially offset Raman spectroscopy (m-SORS) provides a new analytical tool for interrogating the chemical make-up of thin stratified layers in highly turbid media.[1]
We demonstrate experimentally for the first time an additional capability of m-SORS to determine whether detected chemical compounds either originate from distinct, separate layers or whether they are mixed in a single layer
A two-chemical component system was interrogated when deposited as two distinct layers or when mixed homogeneously in a single layer (Measurement I)
Summary
The recently developed technique of defocused micrometer-scale spatially offset Raman spectroscopy (m-SORS) provides a new analytical tool for interrogating the chemical make-up of thin stratified layers in highly turbid media.[1]. We demonstrate experimentally for the first time an additional capability of m-SORS to determine whether detected chemical compounds either originate from distinct, separate (sub-) layers or whether they are mixed in a single (sub-) layer. The first measurement (the ‘‘imaged’’ position) yields typically a Raman spectrum dominated by the surface layer and corresponds conceptually to a zero-spatially offset measurement in a conventional SORS analysis.
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