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Near-Infrared Molecular Emission from a Gas Fountain
- Source :
- Applied Spectroscopy; December 1994, Vol. 48 Issue: 12 p1461-1467, 7p
- Publication Year :
- 1994
-
Abstract
- An electrothermal fountain is used to heat gas-phase samples in the range of 300 to 400°C in order to observe their near-infrared (NIR) emissions. In conjunction with the fountain, a 1/8-m Ebert monochromator and an uncooled PbS detector are shown to be sufficiently sensitive for recording the NIR fingerprints of CH4, CO2, N2O, and C2H6. At fountain temperatures of approximately 400°C, the molecular emission is confined to the long wavelength NIR region (1600–2500 nm) and yields limits of detection in the range of 4 to 10% v/v (3–10 mg/s). Reproducibilities have relative standard deviations of 3.0%. The calibration curves for the gases examined in this study have small linear dynamic ranges (factors of 2 to 10) and exhibit some degree of upward curvature. Ramifications of the application of NIR molecular emission spectroscopy to the qualitative and quantitative analyses of mixtures are discussed.
Details
- Language :
- English
- ISSN :
- 00037028
- Volume :
- 48
- Issue :
- 12
- Database :
- Supplemental Index
- Journal :
- Applied Spectroscopy
- Publication Type :
- Periodical
- Accession number :
- ejs42373995
- Full Text :
- https://doi.org/10.1366/0003702944027895