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Temperature dependences of self- and N2-broadened line-shape parameters in the ν3 and ν5 bands of 12CH3D: Measurements and calculations
- Source :
- JQSRT, JQSRT, 2016, 177 pp.181-215
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- This paper presents the results of a spectroscopic line shape study of self- and nitrogen-broadened 12CH3D transitions in the ν3 and ν5 bands in the Triad region. We combined five pure gas spectra with eighteen spectra of lean mixtures of 12CH3D and nitrogen, all recorded with a Bruker IFS-125 HR Fourier transform spectrometer. The spectra have been analyzed simultaneously using a multispectrum nonlinear least squares fitting technique. N2-broadened line parameters for 184 transitions in the ν3 band and 205 transitions in the ν5 band were measured. In addition, line positions and line intensities were measured for 168 transitions in the ν3 band and 214 transitions in the ν5 band. We have observed 10 instances of weak line mixing corresponding to K″=3 A1 or A2 transitions. Comparisons were made for the N2-broadening coefficients and associated temperature exponents with corresponding values calculated using a semi-classical Robert Bonamy type formalism that involved an inter-molecular potential with terms corresponding to short- and long-range interactions, and exact classical molecular trajectories. The theoretical N2-broadened coefficients are overestimated for high J values, but are in good agreement with the experimental values for small and middle range J values.
- Subjects :
- Physics
Radiation
010504 meteorology & atmospheric sciences
Fourier transform spectrometers
Infrared spectroscopy
01 natural sciences
Atomic and Molecular Physics, and Optics
Spectral line
Formalism (philosophy of mathematics)
Nuclear magnetic resonance
Non-linear least squares
0103 physical sciences
Weak line
Atomic physics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
010303 astronomy & astrophysics
Spectroscopy
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- JQSRT, JQSRT, 2016, 177 pp.181-215
- Accession number :
- edsair.doi.dedup.....180a03b789c423f71b8437a214b37765