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High-sensitivity measurements of 12CH3D pure rotational lines in ground and excited vibrational states in the subTHz region
- Source :
- Journal of Quantitative Spectroscopy and Radiative Transfer, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2020, 242, pp.106781. ⟨10.1016/j.jqsrt.2019.106781⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- Pure rotational transitions of 12CH3D having intensity down to 7.9 × 10−30 cm/molecule were studied with a high sensitive spectrometer with radio-acoustic detection of absorption. Among the 14 measured spectral lines, 11 correspond to the rotational transitions within the first three excited states of 12CH3D. The theoretical description was carried out using an effective polyad model expressed in irreducible tensor form including a Triad of interacting bands. An accurate set of ground state rotational and centrifugal distortion constants was determined using a simultaneous weighted fit of experimental transitions available in the literature together with the new subTHz measurements. The pressure broadening and shifting parameters of the JK = 10–00 ground state rotational lines were measured. The shift coefficients of the ground state rotational lines QR(J,K) with Jmax = 5 were estimated using the data for the lines of excited vibrational bands and confirmed our experimental results. The information on pressure shifting allowed evaluating possible systematic errors of determining line positions.
- Subjects :
- Physics
[PHYS]Physics [physics]
Radiation
010504 meteorology & atmospheric sciences
Spectrometer
THz region
GSCD
pure rotational lines
01 natural sciences
Atomic and Molecular Physics, and Optics
Spectral line
12 CH3D
Distortion
Excited state
ground state parameters
Molecule
[CHIM]Chemical Sciences
Atomic physics
Ground state
Absorption (electromagnetic radiation)
Methane
Spectroscopy
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Line (formation)
Subjects
Details
- Language :
- English
- ISSN :
- 00224073
- Database :
- OpenAIRE
- Journal :
- Journal of Quantitative Spectroscopy and Radiative Transfer, Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2020, 242, pp.106781. ⟨10.1016/j.jqsrt.2019.106781⟩
- Accession number :
- edsair.doi.dedup.....b0429ead286b315c656d52ca80fd2f15