Authors: Brown, Chris W.; Zhou, Jing

Source: Applied Spectroscopy, Volume 55, Issue 1, Pages 10A-54A and 1-104 (January 2001) , pp. 44-49(6)

Publisher: Society for Applied Spectroscopy

Abstract:

A 100-compound near-infrared (IR) spectral library of environmentally important gases was generated. All the library spectra were measured from 4000 to 9000 cm^-1 at a resolution of 2 cm^-1. Spectra of 17 test mixtures including 9 two-component mixtures, 5 three-component mixtures, and 3 four-component mixtures were measured. Two of the 9 two-component mixture spectra were measured at a resolution of 8 cm^-1 and two at 16 cm^-1; all the other mixtures were measured at 2 cm^-1 resolution. A mixture search routine was used for identifying the components in the mixtures. In a search using the near-IR region of 4000 to 8000 cm^-1, all components in the 9 two-component mixtures, all components in 5 three-component mixtures except for one component (o-xylene in a mixture of the three xylenes) and all components in the 3 four-component mixtures except for one component (a ketone) were correctly identified. The mixture search was repeated with the 4000 to 6200 cm^-1 region and all components in all the 17 mixtures were correctly identified. Thus, by the decision to limit the near-IR fingerprint region of 4000-5000 cm^-1 and the overtone region of the C-H stretching vibration at 5600-6200 cm^-1, the informational content was optimized. The results suggest that the 4000-6200 cm^-1 region could be used for monitoring gas mixtures.

Keywords: NEAR-INFRARED; SPECTRAL; LIBRARY; ENVIRONMENTALLY; IMPORTANT; GASES; SPECTRA

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702011951416

Affiliations: 1: Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881

Publication date: 2001-01-01

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