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Abstract <p>Chloroform is one of dangerous air pollutants. To control it in the atmosphere by absorption spectroscopy, it is necessary to know the position of its spectral lines. In this work, the absorption spectra of CH<sup>37</sup>Cl<sub>3</sub> isotopologue of gaseous chloroform are measured using a high-resolution nonstationary spectrometer in the frequency range 118–175 GHz, where spectroscopic data for this compound are absent. The identification of the chloroform lines presented in the literature and assigned to the vibrational state ν<sub>2</sub> of CH<sup>35</sup>Cl<sub>3</sub> is refined; their belonging to CH<sup>37</sup>Cl<sub>3</sub> isotopologue is shown. The experimental results are compared with our theoretical estimates of absorption line centers of the rotational spectrum of this molecule in the same spectral range. Absorption lines of CH<sup>37</sup>Cl<sub>3</sub> isotopologue in the ground state were detected and identified in the spectral subranges near 131.4, 137.6, 150.1, and 156.4 GHz. Based on the experimental spectra, we have estimated the molecular constants <i>B</i> = 3129.56 MHz, <i>D</i><sub><i>J</i></sub> = 1.34 kHz, and <i>D</i><sub><i>JK</i></sub> = −2.25 kHz with RMSE = 7.84 × 10<sup>−2</sup>&#xa0;MHz, which determine transition frequencies in absorption spectra near 150.1 and 156.4 GHz more accurately than molecular constants given in the literature (<i>B</i> = 3129.61 MHz, <i>D</i><sub><i>J</i></sub> = 1.37 kHz, and <i>D</i><sub><i>JK</i></sub>&#xa0;= −2.28 kHz with RMSE = 11.55 × 10<sup>−2</sup> MHz). The results can be used for controlling the atmospheric content of chloroform.</p>

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High-Resolution Spectroscopy Study of the Spectrum of CH37Cl3 Isotopologue of Gaseous Chloroform in 2-mm Wavelength Range

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • V. L. Vaks,
  • E. G. Domracheva,
  • M. B. Chernyaeva,
  • V. A. Anfertev,
  • A. K. Tretyakov,
  • Yu. V. Kistenev

摘要

Abstract

Chloroform is one of dangerous air pollutants. To control it in the atmosphere by absorption spectroscopy, it is necessary to know the position of its spectral lines. In this work, the absorption spectra of CH37Cl3 isotopologue of gaseous chloroform are measured using a high-resolution nonstationary spectrometer in the frequency range 118–175 GHz, where spectroscopic data for this compound are absent. The identification of the chloroform lines presented in the literature and assigned to the vibrational state ν2 of CH35Cl3 is refined; their belonging to CH37Cl3 isotopologue is shown. The experimental results are compared with our theoretical estimates of absorption line centers of the rotational spectrum of this molecule in the same spectral range. Absorption lines of CH37Cl3 isotopologue in the ground state were detected and identified in the spectral subranges near 131.4, 137.6, 150.1, and 156.4 GHz. Based on the experimental spectra, we have estimated the molecular constants B = 3129.56 MHz, DJ = 1.34 kHz, and DJK = −2.25 kHz with RMSE = 7.84 × 10−2 MHz, which determine transition frequencies in absorption spectra near 150.1 and 156.4 GHz more accurately than molecular constants given in the literature (B = 3129.61 MHz, DJ = 1.37 kHz, and DJK = −2.28 kHz with RMSE = 11.55 × 10−2 MHz). The results can be used for controlling the atmospheric content of chloroform.