Remote Raman spectroscopy of natural rocks
Autor: | Shiv K. Sharma, John N. Porter, Anupam K. Misra, Przemyslaw Dera, G. Berlanga, Tayro E. Acosta-Maeda, G. Jeffrey Taylor, Hannah Shelton |
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Rok vydání: | 2019 |
Předmět: |
Olivine
Mineral Materials science business.industry Analytical chemistry Pyroxene engineering.material 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics symbols.namesake Optics 0103 physical sciences symbols engineering Plagioclase Electrical and Electronic Engineering business Spectroscopy Raman spectroscopy Engineering (miscellaneous) Quartz Raman scattering |
Zdroj: | Applied optics. 58(32) |
ISSN: | 1539-4522 |
Popis: | We report the remote Raman spectra of natural igneous, metamorphic, and sedimentary rock samples at a standoff distance of 5 m. High-quality remote Raman spectra of unprepared rocks are necessary for accurate and realistic analysis of future Raman measurements on planetary surfaces such as Mars. Our results display the ability of a portable compact remote Raman system (CRRS) to effectively detect and isolate various light- and dark-colored mineral phases in natural rocks. The CRRS easily detected plagioclase and potassium feldspar end members, quartz, and calcite in rocks with high fluorescence backgrounds. Intermediate feldspars and quartz, when found in rocks with complex mineralogies, exhibited band shifts and broadening in the ${504{-}510}\,\,{{\rm cm}^{ - 1}}$504−510cm−1 and ${600{-}1200}\,\,{{\rm cm}^{ - 1}}$600−1200cm−1 regions. A good approximation of intermediate plagioclase feldspars was possible by using overall Raman spectral shape and assigning other minor Raman peaks in addition to the $ 504{-}510\,\,{{\rm cm}^{ - 1}}$504−510cm−1 peaks. Detection of olivine and pyroxene in mafic rocks allowed for compositional characterization. |
Databáze: | OpenAIRE |
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