Investigation of the chloroform gas phase spectra in the 2-mm wavelength range using high-resolution nonstationary spectroscopy
V.L. Vaks1,2,3, E.G. Domracheva1,2, M.B. Chernyaeva2, V.A. Anfertev1,2, Yu.V. Kistenev3,4
1Institute of Applied Physics of the Russian Academy of Sciences, Institute for Physics of Microstructures RAS, Nizhny Novgorod, Russia
2National Research Lobachevsky State University of Nizhni Novgorod, Nizhny Novgorod, Russia
3National Research Tomsk State University, Tomsk, Russia
4V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: chlorine-containing atmospheric gas, chloroform, rotational spectrum, terahertz nonstationary spectroscopy
Abstract
To detect ecotoxicants in the atmosphere by absorption spectroscopy, it is necessary to know their spectroscopic parameters. The absorption spectra of chloroform in a gas phase in the 2-mm wavelength subranges, where spectroscopic data are absent, were measured using high resolution spectrometer with phase-switching. The experimental results were compared with theoretical estimates of the absorption rotational line central frequencies. After preliminary measurements in the 118.6-118.9 GHz subrange, their comparison with the literature data, and confirmation of the possibility of reliable detection of absorption lines in the spectrum, the absorption lines for CH35Cl3 in the ground and in excited vibrational states (ν3, 2ν3) in the 131 ÷ 132, 137 ÷ 139, 150 ÷ 152, and 156 ÷ 158 GHz spectral ranges have been revealed and identified. Presented results can be used for detection of CH35Cl3 in the atmosphere.
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