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CO 2 Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers
Author(s) -
Hagiwara Yuuki,
Takahata Kohei,
Torimoto Junji,
Yamamoto Junji
Publication year - 2018
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5461
Subject(s) - raman spectroscopy , thermometer , diad , raman scattering , thermal expansion , analytical chemistry (journal) , chemistry , materials science , mineralogy , thermodynamics , optics , physics , composite material , chromatography , copolymer , polymer
CO 2 fluid inclusions are popular in the mantle‐derived rock. CO 2 Raman densimeter is widely used for estimating depth provenance and magma plumbing system. However, in order to obtain precise CO 2 density, we should also measure CO 2 temperature simultaneously because the densimeter has temperature dependency. In this study, we measured CO 2 Raman spectra with densities of 0.8–1.0 g/cm 3 at temperatures of 15, 25, 35, 45, and 55°C using a high‐pressure optical cell. We propose a new equation relating hot bands to the Fermi diad intensity ratio, temperature, and distance between the Fermi diad (delta, cm −1 ), which has higher accuracy than those of previous studies (±3.9–4.7°C) across all measurement conditions. The change in temperature engenders thermal expansion or shrinkage of mineral, resulting in change in CO 2 density of fluid inclusion. Simultaneous measurement of both density and temperature of CO 2 will be a probe for elastic property of minerals.