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High-temperature emission spectroscopy of methane
High-temperature emission spectroscopy of methane
- Source :
- Journal of Quantitative Spectroscopy and Radiative Transfer, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2008, 109, pp.2027-2036. ⟨10.1016/j.jqsrt.2008.01.023⟩, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2008, 109, pp.2027-2036. 〈10.1016/j.jqsrt.2008.01.023〉, Journal of Quantitative Spectroscopy and Radiative Transfer, 2008, 109, pp.2027-2036. ⟨10.1016/j.jqsrt.2008.01.023⟩
- Publication Year :
- 2008
- Publisher :
- HAL CCSD, 2008.
-
Abstract
- International audience; A high-enthalpy source (HES) has been developed in Rennes either to heat gases up to 2000K in local thermodynamic equilibrium (LTE) or to generate hypersonic expansions. The HES prototype has been associated with a high-resolution Bruker IFS 120 HR Fourier transform spectrometer to record emission spectra of hot gases, in LTE conditions. A series of emission spectra of methane has been obtained at 1005, 1365, 1485, 1625 and 1820K in the pentad spectral region located around 3000 cm1, at Doppler-limited resolution (0.02 cm1). Spectra have been corrected for the transmission function that strongly affects the infrared radiation emitted by the hot gas. Line-integrated absorption cross sections have been extracted from the corrected spectra using an improved procedure for the calculation of the total partition function Q of methane at high temperature. This calculation included anharmonicity and rovibrational interaction effects, and was based on a multi-resolution fully converged direct partition sum. It has been shown that, as the temperature increases above 1000 K, the commonly used harmonic and rigid rotor double approximation to estimate Q leads to underestimated values.
- Subjects :
- Materials science
Thermodynamic equilibrium
Infrared
Infrared spectroscopy
02 engineering and technology
7. Clean energy
01 natural sciences
Spectral line
0103 physical sciences
Emission spectrum
Absorption (electromagnetic radiation)
010303 astronomy & astrophysics
[ SDU.ASTR ] Sciences of the Universe [physics]/Astrophysics [astro-ph]
Spectroscopy
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Radiation
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Anharmonicity
Rotational–vibrational spectroscopy
CRESU
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
[ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Atomic physics
0210 nano-technology
Molecular physics
Subjects
Details
- Language :
- English
- ISSN :
- 00224073
- Database :
- OpenAIRE
- Journal :
- Journal of Quantitative Spectroscopy and Radiative Transfer, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2008, 109, pp.2027-2036. ⟨10.1016/j.jqsrt.2008.01.023⟩, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2008, 109, pp.2027-2036. 〈10.1016/j.jqsrt.2008.01.023〉, Journal of Quantitative Spectroscopy and Radiative Transfer, 2008, 109, pp.2027-2036. ⟨10.1016/j.jqsrt.2008.01.023⟩
- Accession number :
- edsair.doi.dedup.....134f4492cd21c047ab67153fa72dfa60
- Full Text :
- https://doi.org/10.1016/j.jqsrt.2008.01.023⟩