Improved precision of Raman-derived ¹³C/¹²C and ¹⁸O/¹⁶O in CO₂ using bandwidth-fluctuation correction and optimized curve-fitting procedures.

Authors

Junji Yamamoto, Yuuki Hagiwara

Published in

Applied optics. Volume 65. Issue 23. Pages 7804-7811. Aug 10, 2026.

Abstract

By exploiting isotopologue-specific Raman bands, Raman spectroscopic mass spectrometry has emerged as a promising technique for ascertaining the carbon and oxygen isotopic ratios of micrometer-scale CO₂ fluids. For this study, we improve the analytical precision of this technique by reanalyzing Raman spectra of CO₂ at 10 MPa obtained using a high pixel-resolution spectroscopic configuration [Appl. Opt.64, 2711 (2025)APOPAI0003-693510.1364/AO.557083]. Two curve-fitting procedures were applied to the spectral data. In addition, bandwidth-fluctuation correction was introduced to compensate for instrumental drift affecting fitted peak ratios, based on correlation between fitted peak ratios and variations in Raman bandwidths. Combined application of optimized curve-fitting procedures and bandwidth-fluctuation correction improves the precision of Raman-derived isotopic ratios considerably. Results show that the present method enables determination of ¹³C/¹²C and ¹⁸O/¹⁶O of 10 MPa CO₂ fluid, with respective precisions of approximately 2-3‰ and 9-12‰.

PMID:
42593450
Bibliographic data and abstract were imported from PubMed on 13 Aug 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.