Geology applications of Fourier transform infrared spectroscopy information
An attenuated total reflectance (ATR)-FTIR spectrometer.
Fourier transform infrared spectroscopy (FTIR) is a spectroscopic technique that has been used for analyzing the fundamental molecular structure of geological samples in recent decades. As in other infrared spectroscopy, the molecules in the sample are excited to a higher energy state due to the absorption of infrared (IR) radiation emitted from the IR source in the instrument, which results in vibrations of molecular bonds. The intrinsic physicochemical property of each particular molecule determines its corresponding IR absorbance peak, and therefore can provide characteristic fingerprints of functional groups (e.g. C-H, O-H, C=O, etc.).[1]
In geosciences research, FTIR is applied extensively in the following applications:
Analysing the trace amount of water content in Nominally anhydrous minerals (NAMs)[2]
Measuring volatile inclusions in glass and minerals[3]
Estimating the explosion potential in volcanic setting.[4]
Analysing chemotaxonomy of early life on earth[5]
Linking biological affinities of both microfossils and macrofossils[6][7]
These applications are discussed in details in the later sections. Most of the geology applications of FTIR focus on the mid-infrared range, which is approximately 4000 to 400 cm−1.[4]
^Åmand, L. E.; Tullin, C. J. (1997). The Theory Behind FTIR analysis. Göteborg, Sweden: Department of Energy Conversion Chalmers University of Technology. S2CID 16247962.
^Lowenstern, J. B.; Pitcher, B. W. (2013). "Analysis of H2O in silicate glass using attenuated total reflectance (ATR) micro-FTIR spectroscopy". American Mineralogist. 98 (10): 1660. Bibcode:2013AmMin..98.1660L. doi:10.2138/am.2013.4466. S2CID 93410810.
^Mormone, A.; Piochi, M.; Bellatreccia, F.; De Astis, G.; Moretti, R.; Ventura, G. Della; Cavallo, A.; Mangiacapra, A. (2011). "A CO2-rich magma source beneath the Phlegraean Volcanic District (Southern Italy): Evidence from a melt inclusion study". Chemical Geology. 287 (1–2): 66–80. Bibcode:2011ChGeo.287...66M. doi:10.1016/j.chemgeo.2011.05.019.
^ abChen, Y; Zou, C; Mastalerz, M; Hu, S; Gasaway, C; Tao, X (2015). "Applications of Micro-Fourier Transform Infrared Spectroscopy (FTIR) in the Geological Sciences—A Review". International Journal of Molecular Sciences. 16 (12): 30223–50. doi:10.3390/ijms161226227. PMC 4691169. PMID 26694380.
^Marshall, C; Javaux, E; Knoll, A; Walter, M (2005). "Combined micro-Fourier transform infrared (FTIR) spectroscopy and micro-Raman spectroscopy of Proterozoic acritarchs: a new approach to palaeobiology". Precambrian Research. 138 (3–4): 208. Bibcode:2005PreR..138..208M. doi:10.1016/j.precamres.2005.05.006.
^Zodrow, Erwin L.; d'Angelo, José A.; Mastalerz, Maria; Keefe, Dale (2009). "Compression–cuticle relationship of seed ferns: Insights from liquid–solid states FTIR (Late Palaeozoic–Early Mesozoic, Canada–Spain–Argentina)". International Journal of Coal Geology. 79 (3): 61. doi:10.1016/j.coal.2009.06.001.
^Zodrow, Erwin L; Mastalerz, Maria; Orem, William H; s̆Imůnek, Zbynĕk; Bashforth, Arden R (2000). "Functional groups and elemental analyses of cuticular morphotypes of Cordaites principalis (Germar) Geinitz, Carboniferous Maritimes Basin, Canada". International Journal of Coal Geology. 45: 1–19. doi:10.1016/S0166-5162(00)00018-5.
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