Analysis of the Interacting Octad System of 12CH4

Hilico, J. C.; Robert, O Green; Loëte, M.; Toumi, Salah; Pine, A. S.; Brown, Linda R.

doi:10.1006/jmsp.2001.8364

Cited by 66 publications

(45 citation statements)

References 34 publications

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“…In addition to lacking 13 CH 4 lines in that region, HITRAN2008 contained many duplicated transitions. Often a transition would appear as an empirical unassigned line as well as predictions from Hilico et al [208] . With that being said, some observable transitions were also missing in HITRAN2008.…”

Section: 0 0-4630 CM −1 (Correspond To Strongest Octad Bands)mentioning

confidence: 99%

“…Many unassigned empirical lines were then given assignments and lower-state energies from corresponding predicted Hilico et al [208] lines, while predicted lines (usually with inaccurate line position and intensity) were removed. In the region 4190-4315 cm −1 , parameters of lines with the worst remaining residuals (with respect to low-pressure Kitt Peak FTS spectra) were then replaced with the preliminary results of Birk et al [188] , which used quantum assignments of yet unpublished theoretical work [209] that was not always the same as in HITRAN2012.…”

Section: 0 0-4630 CM −1 (Correspond To Strongest Octad Bands)mentioning

confidence: 99%

See 1 more Smart Citation

The HITRAN 2004 molecular spectroscopic database

Rothman

Jacquemart

Barbé

et al. 2005

Journal of Quantitative Spectroscopy and Radiative Transfer

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2,783

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Section: 0 0-4630 CM −1 (Correspond To Strongest Octad Bands)mentioning

confidence: 99%

Section: 0 0-4630 CM −1 (Correspond To Strongest Octad Bands)mentioning

confidence: 99%

The HITRAN 2004 molecular spectroscopic database

Rothman

Jacquemart

Barbé

et al. 2005

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

2,783

2,115

View full text Add to dashboard Cite

“…These 19 vibrational states are in fact comprised of 37 separate vibrational sublevels, most of which ultimately give rise to infrared absorption from the ground state. Although the Enneadecad of CH 3 D corresponds to the Octad of CH 4 from 2.1 to 2.8 μm [13], the detailed comparison of corresponding bands is not obvious. The Enneadecad of CH 3 D contains 12, 7 and 18 sublevels of symmetry A 1 , A 2 and E, respectively, while the Octad of CH 4 contains 4, 2, 5, 5, 8 sublevels of symmetry A 1 , A 2 , E, F 1 , F 2 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Preliminary analysis of CH3D from 3250 to 3700cm−1

Nikitin

Champion

Brown

2006

Journal of Molecular Spectroscopy

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The infrared spectrum of CH3D from 3250 to 3700 cm =1 was studied for the rst time to assign transitions involving the ν2+ν3, ν2+ν5, ν2+ν6, ν3+2ν6 and 3ν6 vibrational states. Line positions and intensities were measured at 0.011 cm =1 resolution using Fourier transform spectra recorded at Kitt Peak with isotopically enriched samples.Some 2852 line positions (involving over 900 upper state levels) and 874 line intensities were reproduced with RMS values of 0.0009 cm =1 and 4.6%, respectively. The strongest bands were found to be ν2 + ν3 at 3499.7 cm =1 and ν2 + ν6 at 3342.5 cm =1 with integrated strengths, respectively, of 8.17 Ö 10 =20 and 2.44 Ö 10 =20 (cm =1 /molecule · cm =2 ) at 296 K (for 100% CH3D). The eective Hamiltonian was expressed in terms of irreducible tensor operators and adapted to symmetric top molecules. Its present conguration in the MIRS package permitted simultaneous consideration of the four lowest polyads of CH3D: the Ground State (G.S.), the Triad from 6.3 to 9.5 mm, the Nonad from 3.1 to 4.8 mm and now the Enneadecad (19 bands) from 2.2 to 3.1 mm. The CH3D line parameters for this interval were calculated to create a new database for the 3 mm region.

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“…Extensive studies of the methane spectrum are available in the literature. [24][25][26][27] More recent work from Jourdanneau et al [17] includes experimental investigation at low pressure (1 amagat), for temperatures ranging from 300 K to 900 K, and a quantum mechanical model is proposed with parameters obtained by best fit to the experimental spectra.…”

Section: 1methanementioning

confidence: 99%

Raman spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane for combustion applications

Magnotti

Varghese

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Spontaneous Raman scattering measurements of temperature and major species concentration in hydrocarbon-air flames require detailed knowledge of the Raman spectra of the hydrocarbons present when fuels more complex than methane are used. Although hydrocarbon spectra have been extensively studied at room temperature, there are no data available at higher temperatures. Quantum mechanical calculations, when available are not sufficiently accurate for combustion applications. This work presents experimental measurements of spontaneous Stokes-Raman scattering spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane in the temperature range 300-860 K. Raman spectra from heated hydrocarbons jets have been collected with a higher resolution than is generally employed for Raman measurements in combustion applications. A set of synthetic spectra have been generated for each hydrocarbon, providing the basis for extrapolation to higher temperatures. The spectra provided here will enable simultaneous measurements of multiple hydrocarbons in flames. This capability will greatly extend the range of applicability of Raman measurements in combustion applications. In addition, the experimental spectra provide a validation dataset for quantum mechanical models.

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Analysis of the Interacting Octad System of 12CH4

Cited by 66 publications

References 34 publications

The HITRAN 2004 molecular spectroscopic database

The HITRAN 2004 molecular spectroscopic database

Preliminary analysis of CH3D from 3250 to 3700cm−1

Raman spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane for combustion applications

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