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Measurements of line intensities for some lines of methyl iodide in the ν5 and ν3 + ν6 bands

Abstract : The line intensities for RR- and PP- sub-branch transitions in the ν5 and ν3 + v6 bands of CH3I are measured for the first time for 270 lines with 5 ≤ J ≤ 40 and 4 ≤ K ≤ 11 using a multi-pressure fitting method with a Voigt profile. Seven spectra have been recorded using the Bruker IFS125HR Fourier Transform Spectrometer at the AILES beamline of SOLEIL Synchrotron with a resolution of 0.002 cm-1 for pressures between 0.270 and 2.433 mbar. Line intensities are analyzed and discussed as a function of the rotational quantum numbers. On average, the accuracy of the measured data is estimated to be about 4.5% for the two bands.

The measured line intensities have been used to derive the vibrational transition moment, the Herman-Wallis parameters as well as the intensities of the two bands. The values for the band strengths of the ν5 and ν3 + v6are respectively 46.47 ± 2.63 cm-2 atm-1 and 14.79 ± 1.60 cm-2 atm-1. The measured line intensities were reproduced with mean values of difference of about 8.3% and 3.8% for the ν5 and ν3 + v6 bands respectively.

At pressure used in this work, analysis of the overlapped line using the Rosenkranz profile demonstrates a negligible line-mixing effect on line intensities.

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https://hal-insu.archives-ouvertes.fr/insu-03749630
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Submitted on : Thursday, August 11, 2022 - 10:21:55 AM
Last modification on : Friday, August 12, 2022 - 3:41:12 AM

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A. Boughdiri, L. Manceron, N. Maaroufi, M. Rotger, H. Aroui. Measurements of line intensities for some lines of methyl iodide in the ν5 and ν3 + ν6 bands. Journal of Quantitative Spectroscopy and Radiative Transfer, 2018, 221, pp.147-154. ⟨10.1016/j.jqsrt.2018.10.004⟩. ⟨insu-03749630⟩

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