Infrared absorption by pure CO 2 near 3340 cm −1 : Measurements and analysis of collisional coefficients and line-mixing effects at subatmospheric pressures

Daneshvar, Leila; Földes, Tomáš; Buldyreva, J.; Auwera, J. Vander

doi:10.1016/j.jqsrt.2014.08.007

Cited by 27 publications

(16 citation statements)

References 48 publications

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“…The self-broadening parameters of rovibrational lines of methyl iodide were retrieved during our line intensities study, from simultaneous fits of the pure methyl iodide spectra recorded in our previous work [16] using a multi-spectrum least squares fitting algorithm, developed in Brussels [19,20] . This program adjusts spectroscopic (e.g.…”

Section: Retrieval Of Self-broadening Coefficientsmentioning

confidence: 99%

Self and N2 collisional broadening of rovibrational lines in the ν6 band of methyl iodide (12CH3I) at room temperature: The J and K dependence

Attafi

Hassen

Aroui

et al. 2019

Journal of Quantitative Spectroscopy and Radiative Transfer

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Following our recent study devoted to measurements of intensities of rovibrational lines in the ν 6 band of methyl iodide (12 CH 3 I) centered at 892.918 cm −1 , room temperature infrared spectra of methyl iodide diluted in nitrogen at fourteen total pressures between 20 and 300 hPa have been recorded using the Fourier transform spectrometer Bruker IF125HR located at the LISA facility in Créteil. Three hundred and forty six N 2-broadening coefficients of methyl iodide rovibrational lines have been measured in the 824-951 cm −1 spectral range using mono-spectrum non-linear least squares fitting of Voigt profiles. Pressure-induced line shifts were not needed to fit the spectra to the noise level and line mixing effects could be neglected. Six hundred and eight self-broadening coefficients have also been measured in the same spectral range using the pure methyl iodide spectra recorded in our previous work. The measured self-broadening coefficients range from 0.1460 to 0.3786 cm − 1 atm −1 and the N 2-broadening coefficients range from 0.0723 to 0.1481 cm −1 atm − 1 at 295 K. The average accuracy on the measured self-and N 2-broadening coefficients was estimated to 3%. Comparisons with measurements reported in the literature for the ν 5 band of CH 3 I shows a satisfactory agreement with average differences of 7% and 4% for the self-and N 2-broadening coefficients, respectively. The J and K rotational dependences of these coefficients have been observed and the latter modeled using an empirical polynomial expansion. On average, the empirical expression reproduces the measured self-and N 2-broadening coefficients to within 3% and 4%, respectively. The data obtained in the present work represent a significant contribution to the determination of broadening coefficients of CH 3 I and complement the list of line positions and intensities generated in our previous work, thus providing useful spectroscopic information for atmospheric remote sensing and industrial detection of CH 3 I.

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Section: Retrieval Of Self-broadening Coefficientsmentioning

confidence: 99%

Self and N2 collisional broadening of rovibrational lines in the ν6 band of methyl iodide (12CH3I) at room temperature: The J and K dependence

Attafi

Hassen

Aroui

et al. 2019

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…To our knowledge, the present work reports the first systematic measurements of selfbroadening coefficients for 2028 rovibrational transitions in the P, Q, and R branches of  3 and 2 3 - 3 bands for both CH 3 35 Cl and CH 3 37 Cl isotopologues. These measurements have been performed using Fourier Transform spectra recorded with natural CH 3 Cl sample.…”

Section: A C C E P T E D Mmentioning

confidence: 84%

“…Guinet et al [20] have performed experimental studies by terahertz techniques and semi-classical calculations of N 2 -broadening coefficients of CH 3 Cl. Ref. [21] was dedicated to the measurements of line positions, line intensities and self-broadening for several transitions of both CH 3 35 Cl and CH 3 37 Cl isotopologues belonging to the  5 band. Self-broadenings of CH 3 Cl were measured by Bray et al at room temperature for 527 transitions of the  1 band with a high-resolution…”

Section: A C C E P T E D Mmentioning

confidence: 99%

Measurement and modeling of self-broadening coefficients of the ν3 and 2ν3-ν3 bands of methyl chloride

Dridi

Maaroufi

Manceron

et al. 2019

Journal of Quantitative Spectroscopy and Radiative Transfer

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 Self-broadening coefficients have been measured in the  3 and 2 3 - 3 bands of CH 3 Cl. The rotational dependencies of broadening coefficients were analyzed. The data are modeled using a second-order empirical polynomial.  Broadening coefficients were predicted using the Robert and Bonamy formalism with parabolic and exact trajectory models. The RBE model is not necessary for calculations of self-broadening of CH 3 Cl even at low temperature.

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“…The line intensities were measured using a multi-spectrum fitting program developed in Brussels [18,19]. This program adjusts spectroscopic (e.g.…”

Section: C1 Retrieval Of Line Intensitiesmentioning

confidence: 99%

Line intensities for the ν6 and 2ν3 bands of methyl iodide (12CH3I)

Kwabia-Tchana

Attafi

Manceron

et al. 2019

Journal of Quantitative Spectroscopy and Radiative Transfer

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The goal of this study is to measure for the first time absolute line intensities for the ν 6 band of methyl iodide (CH 3 I) centered at 892.918 cm-1. High-resolution Fourier transform spectra were recorded at various pressures for the whole 500-1450 cm-1 spectral range. Using these spectra, a large set of CH 3 I individual line intensities was measured for the  6 band. These experimental intensities were least squares fitted to derive the expansion of the  6 transition moment operator. The theoretical model used to describe the line positions and intensities accounts for the hyperfine structure in the 6 1 and ground states and for the vibration-rotation resonances that couple the 6 1 energy levels with those of the 3 2 and 2 1 vibrational states [A. Perrin et al., J. Mol. Spectrosc. 324 (2016) 28-35]. As the 2 3 band is extremely weak, its associated transition moment operator was estimated from band strength available in the literature. A comprehensive list of line positions and intensities was generated for the  6 and 2 3 bands of CH 3 I at 11 µm, which should be useful for the possible detection of this species by the future IASI-NG satellite instrument (Infrared Atmospheric Sounding Interferometer New Generation), now under preparation (https://iasi-ng.cnes.fr/en/IASI-NG/index.htm).

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Infrared absorption by pure CO 2 near 3340 cm −1 : Measurements and analysis of collisional coefficients and line-mixing effects at subatmospheric pressures

Cited by 27 publications

References 48 publications

Self and N2 collisional broadening of rovibrational lines in the ν6 band of methyl iodide (12CH3I) at room temperature: The J and K dependence

Self and N2 collisional broadening of rovibrational lines in the ν6 band of methyl iodide (12CH3I) at room temperature: The J and K dependence

Measurement and modeling of self-broadening coefficients of the ν3 and 2ν3-ν3 bands of methyl chloride

Line intensities for the ν6 and 2ν3 bands of methyl iodide (12CH3I)

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