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Liquid-Nitrogen-Cooled Optical Cell for the Study of Absorption Spectra in a Fourier Spectrometer

Abstract

A low-temperature 17.5-cm long vacuum cell with removable quartz, ZnSe, and KBr windows has been designed for working with the high-resolution Bruker IFS 125M FT-IR spectrometer. The cell provides a threshold absorption sensitivity of about 10−6 cm−1. The cell makes it possible to record the absorption spectra of gases in the region 1000–20 000 cm−1 in the temperature range from 108 to 298 K with an error of ±0.1 K. The 12CH4 absorption spectra were recorded in the range from 9000 to 9200 cm−1 at a pressure of 300 mbar and a temperature of 298 and 108 K with a spectral resolution of 0.03 cm−1. The empirical values of the energy levels of lower states were calculated from the ratios of line intensities measured at different temperatures.

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ACKNOWLEDGMENTS

The work was supported by the Russian Science Foundation (grant no. 17–17–01170).

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Correspondence to L. N. Sinitsa, A. A. Lugovskoi or N. M. Emel’yanov.

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Translated by O. Ponomareva

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Serdyukov, V.I., Sinitsa, L.N., Lugovskoi, A.A. et al. Liquid-Nitrogen-Cooled Optical Cell for the Study of Absorption Spectra in a Fourier Spectrometer. Atmos Ocean Opt 33, 393–399 (2020). https://doi.org/10.1134/S1024856020040144

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Keywords:

  • Fourier spectroscopy
  • absorption spectrum
  • methane