Raman spectroscopy is an efficient non-contact and non-destructive method. It is a potential approach to quantitatively measure the carbon isotopic composition ((CO2)-C-13/(CO2)-C-12) of CO2 in single fluid inclusion. Based on the theoretical analysis, Raman spectroscopy can reasonably be applied to measure the carbon isotopic composition of CO2. It can theoretically be expressed as, (CO2)-C-13/(CO2)-C-12 = (I-13CO2/I-12CO2)center dot(sigma(12CO2)/sigma(13CO2)), in which the ratio of cross section (sigma(12CO2)/sigma(13CO2)) is determined from Raman spectra of standard CO2 sample. Therefore, Raman measurement process can be described as, from standard to analytical samples. In natural CO2 sample, the (CO2)-C-13 concentration is very low. Compared to (CO2)-C-12, Raman intensity of (CO2)-C-13 is much weaker. This greatly affects the accuracy and precision of Raman measurement on the (CO2)-C-13/(CO2)-C-12. In this work, a method is provided in order to improve the accuracy and precision of measured (CO2)-C-13/(CO2)-C-12.
| Publication name | CHEMICAL GEOLOGY Volume585 Article Number120570 DOI10.1016/j.chemgeo.2021.120570 PublishedDEC 20 2021 | | Author(s) | Cui, Shuai; Wang, Weiqi; Cheng, Chuanbao; Yao, Ying; Qin, Chaojian; Sun, Qiang | | Corresponding author(s) | SUN Qiang
QiangSun@pku.edu.cn
Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China | | Author(s) from IGCAS | QIN Chaojian | View here for the details
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