Three-Dimensional Raman Tomographic Microspectroscopy: A Novel Imaging Technique

• Main Authors: Yeşiltaş, Mehmet, Jaret, Steven, Young, Jordan, Wright, Shawn P., Glotch, Timothy D.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Amer Geophysical Union 2018
• Subjects: Raman microspectroscopy; meteorites; minerals; tomography; three-dimensional; imaging; Antarctic; The Antarctic; Antarc*
• Online Access: https://hdl.handle.net/20.500.11857/3392; https://doi.org/10.1029/2018EA000369

Chemical constituents and their spatial distributions in terrestrial and extraterrestrial samples may provide clues to their formation histories and secondary processes they were subjected to. Most analytical tools are either limited in imaging the interior of samples or they are destructive such that the sample is chemically modified. In this work, we have conducted three-dimensional Raman tomographic imaging experiments on both terrestrial and extraterrestrial samples. The in situ nondestructive analytical technique presented here provides spatial distribution of various chemical constituents from the interior of the samples with high spatial and depth resolution. Raman data were first collected from two-dimensional layers at the surface and at various depths inside the samples by means of confocal Raman imaging. Individual chemical distribution maps were generated for each layer, which were then stacked to form and visualize the three-dimensional distributions. In addition to three-dimensional distributions, Raman spectral information was also collected from each pixel within the measured areas, thus allowing us to also perform detailed spectral investigations of the samples. RIS4E node of NASA's Solar System Exploration Research Virtual Institute (SSERVI) We are grateful to NASA's Meteorite Working Group for the meteorite sample from the Antarctic meteorite collection, John Luczaj for the pyrite, Sidney Hemming and Troy Rasbury for the rutile, and Martin Schoonen and Hiroshi Ohmoto (Emeritus at Penn State) for the BIF sample. We thank reviewers and the Editor for their constructive comments. We also wish to thank Volkan Eskizeybek and Arife Aktas (Science and Technology Application and Research Center of Canakkale Onsekiz Mart University, Turkey) for their support during the Raman data collection. This work is funded by the RIS 4 E node of NASA's Solar System Exploration Research Virtual Institute (SSERVI; PI: T. D. Glotch). The data presented here will be made publicly available via Turkish Spectral Database at http://tsd.klu.edu.tr/. WOS:000443994000005 2-s2.0-85052382596