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Aqueous Dissolved Gas Measurements Using Near-Infrared Raman Spectroscopy

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Abstract:

Near-infrared Raman spectra of several gases dissolved in an aqueous medium have been acquired and analyzed for the first time. Spectra of dissolved and gaseous CO2, SO2, N2O, dimethyl ether, and O2 are presented and compared. Raman-forbidden bands in the spectrum of gaseous dimethyl ether are observed in the dissolved spectrum; this result can be explained by relaxed selection rules due to lowered symmetry. Raman scattering enhancements in the dissolved phase are measured and shown to compare well with a theoretical prediction accounting for internal field enhancements in water. Dissolved CO2 is measured quantitatively at concentrations from 0 to 250 Torr with the use of the method of partial least-squares, with an average prediction error of 12 Torr.

Keywords: Cross-section enhancement; Dissolved gases; Near-infrared; Partial least squares; Raman spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953965047

Affiliations: 1: G. R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 2: G. R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307; current address: Department of Chemistry, Whitworth College, Spokane, WA

Publication date: August 1, 1995

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