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In this work, the absolute Raman cross sections of CO2, a molecule important in environmental science and chemical engineering, are determined to high accuracy. To achieve this, we utilized a Raman instrument calibrated for precise intensity measurements using the rotational bands of H2. Supported by rigorous quantum mechanical data on H2 and a careful analysis of uncertainties introduced by various experimental factors, we reduced the uncertainty in the determined cross sections for the Fermi doublet of CO2 to 6% (3\u03c3), with the primary sources of experimental uncertainty stemming from the detectors\u2019 digitization error and thermal fluctuations. This report marks the most precise determination of Raman cross-section values to date, paving the way for improved quantitative Raman analysis of a wide range of samples and the retrieval of experimental transition polarizabilities for benchmarking ab initio methods.<\/jats:p>","DOI":"10.1021\/acs.jpca.6c00827","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T15:01:38Z","timestamp":1791385298000},"page":"8201-8208","source":"Crossref","is-referenced-by-count":0,"title":["Accurate Determination\nof Absolute Raman Cross Sections\nof Carbon Dioxide Using H2 as a Reference"],"prefix":"10.1021","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2495-3354","authenticated-orcid":true,"given":"Ankit","family":"Raj","sequence":"first","affiliation":[{"name":"National Yang Ming Chiao Tung University , , ,","place":["Hsinchu, Taiwan, 30010"]},{"name":"Gakushuin University , , Mejiro 1-5-1, Toshima , ,","place":["Tokyo, Japan, 171-8588"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9013-1287","authenticated-orcid":true,"given":"Henryk A.","family":"Witek","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung University , , ,","place":["Hsinchu, Taiwan, 30010"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiro-o","family":"Hamaguchi","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung University , , ,","place":["Hsinchu, Taiwan, 30010"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"2026102208065674400_cit1","volume-title":"Handbuch der Radiologie :Rayleigh-Streuung und Raman-Effekt","author":"Placzek","year":"1934"},{"key":"2026102208065674400_cit2","doi-asserted-by":"crossref","DOI":"10.1002\/0470845767","volume-title":"The Raman Effect :\nA Unified Treatment of the Theory of Raman Scattering by Molecules","author":"Long","year":"2002"},{"issue":"3","key":"2026102208065674400_cit3","doi-asserted-by":"publisher","first-page":"161","DOI":"10.1002\/jrs.1250070311","article-title":"Effects of hydrogen bonding on the Raman intensities of methanol,\nethanol and water","volume":"7","author":"Abe","year":"1978","journal-title":"J. Raman Spectrosc."},{"issue":"12","key":"2026102208065674400_cit4","doi-asserted-by":"publisher","first-page":"579","DOI":"10.1063\/1.1653548","article-title":"Relative Raman cross\nsection for N2, O2, CO, CO2, SO2, and H2S","volume":"18","author":"Fouche","year":"1971","journal-title":"Appl. Phys. Lett."},{"issue":"7","key":"2026102208065674400_cit5","doi-asserted-by":"publisher","first-page":"256","DOI":"10.1063\/1.1654137","article-title":"Relative Raman Cross\nSection for O3, CH4, C3H8, NO, N2O, and H2","volume":"20","author":"Fouche","year":"1972","journal-title":"Appl.\nPhys. Lett."},{"issue":"1","key":"2026102208065674400_cit6","doi-asserted-by":"publisher","first-page":"73","DOI":"10.1364\/JOSA.63.000073","article-title":"Raman cross section\nof some simple gases","volume":"63","author":"Fenner","year":"1973","journal-title":"J. Opt. Soc. 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Mol.\nSpectrosc."},{"issue":"4","key":"2026102208065674400_cit13","doi-asserted-by":"publisher","first-page":"341","DOI":"10.1002\/jrs.1250010404","article-title":"Absolute intensity\nratios of Raman lines of benzene and ethylene derivatives with 5145\n\u00c5 and 3371 \u00c5 excitation","volume":"1","author":"Udagawa","year":"1973","journal-title":"J. Raman\nSpectrosc."},{"issue":"1","key":"2026102208065674400_cit14","doi-asserted-by":"publisher","first-page":"38","DOI":"10.1002\/jrs.1250060109","article-title":"Absolute Raman\nintensities of liquids","volume":"6","author":"Abe","year":"1977","journal-title":"J. Raman Spectrosc."},{"key":"2026102208065674400_cit15","doi-asserted-by":"publisher","first-page":"551","DOI":"10.1086\/151815","article-title":"Absolute Raman Scattering\nCross-Section of Molecular\nHydrogen","volume":"178","author":"Carlson","year":"1972","journal-title":"Astrophys. 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Acta"},{"issue":"3","key":"2026102208065674400_cit28","doi-asserted-by":"publisher","first-page":"255","DOI":"10.1016\/j.chemgeo.2006.06.025","article-title":"In situ\nquantitative\nanalysis of individual H2O\u2013CO2 fluid\ninclusions by laser Raman spectroscopy","volume":"237","author":"Azbej","year":"2007","journal-title":"Chem.\nGeol."},{"key":"2026102208065674400_cit29","doi-asserted-by":"publisher","first-page":"109449","DOI":"10.1016\/j.jqsrt.2025.109449","article-title":"Simulated\nRaman libraries of gaseous\nCO, H2, N2, O2, CO2, and\nH2O for high-temperature diagnostics","volume":"340","author":"Lill","year":"2025","journal-title":"Journal of Quantitative Spectroscopy and Radiative Transfer"},{"key":"2026102208065674400_cit30","doi-asserted-by":"publisher","first-page":"109223","DOI":"10.1016\/j.jqsrt.2024.109223","article-title":"Accurate simulation\nof spontaneous Raman scattering of CO2 for high-temperature\ndiagnostics","volume":"330","author":"Lill","year":"2025","journal-title":"Journal of Quantitative Spectroscopy\nand Radiative Transfer"},{"issue":"25","key":"2026102208065674400_cit31","doi-asserted-by":"publisher","first-page":"9409","DOI":"10.1021\/acs.analchem.3c00196","article-title":"Natural Gas Analysis\nUsing Polarized Raman Spectroscopy","volume":"95","author":"Petrov","year":"2023","journal-title":"Anal. 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Raman Spectrosc."},{"issue":"10","key":"2026102208065674400_cit34","doi-asserted-by":"publisher","first-page":"2066","DOI":"10.1002\/jrs.5955","article-title":"Toward standardization\nof Raman spectroscopy: Accurate wavenumber and intensity calibration\nusing rotational Raman spectra of H2, HD, D2, and vibration\u2013rotation spectrum of O2","volume":"51","author":"Raj","year":"2020","journal-title":"J. Raman Spectrosc."},{"issue":"12","key":"2026102208065674400_cit35","doi-asserted-by":"publisher","first-page":"2038","DOI":"10.1002\/jrs.6221","article-title":"Accurate intensity\ncalibration of multichannel spectrometers using Raman intensity ratios","volume":"52","author":"Raj","year":"2021","journal-title":"J. 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Raman Spectrosc."},{"issue":"2","key":"2026102208065674400_cit47","doi-asserted-by":"publisher","first-page":"568","DOI":"10.1063\/1.470091","article-title":"Overtone Raman spectrum and molecular\npolarizability surface of CO2","volume":"103","author":"Tejeda","year":"1995","journal-title":"J.\nChem. Phys."},{"issue":"3","key":"2026102208065674400_cit48","doi-asserted-by":"publisher","first-page":"211","DOI":"10.1366\/000370269774380824","article-title":"Gas Phase\nRaman Intensities: A Review\nof \u201cPre-Laser\u201d Data","volume":"23","author":"Murphy","year":"1969","journal-title":"Appl. Spectrosc."},{"key":"2026102208065674400_cit49","volume-title":"Molecular spectra and\nmolecular structure. 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Raman Spectrosc."},{"issue":"5","key":"2026102208065674400_cit52","doi-asserted-by":"publisher","first-page":"054306","DOI":"10.1063\/1.4889995","article-title":"Simulation of the Raman spectra of\nCO2: Bridging the gap between algebraic models and experimental\nspectra","volume":"141","author":"Lemus","year":"2014","journal-title":"J. Chem. 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