CO2–CO2 and CO2–Ar continua at millimeter wavelengths

T. A. Odintsova, E. A. Serov, A. A. Balashov, M. A. Koshelev, A. O. Koroleva, A. A. Simonova, M. Yu Tretyakov, N. N. Filippov, D. N. Chistikov, A. A. Finenko, S. E. Lokshtanov, S. V. Petrov, A. A. Vigasin

Research output: Contribution to journalArticlepeer-review

Abstract

Broadband spectra of the continuum absorption in pure CO2 gas and its mixture with Ar are studied at room temperature using a resonator spectrometer within 105–240 GHz. The expected pressure and frequency dependence is observed. The obtained data are validated by two independent calculations of the interaction-induced absorption using a semiclassical trajectory-based method. The observed continuum is interpreted in terms of bimolecular absorption, including a significant contribution from true bound dimers. A simplified formula describing both frequency and temperature dependency of the CO2–Ar continuum within a frequency range from 60 GHz to 450 GHz at temperatures from 200 K to 400 K is suggested for use in atmospheric studies.

Original languageEnglish
Article number107400
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume258
DOIs
StatePublished - Jan 2021

Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

Keywords

  • Bimolecular absorption
  • Carbon dioxide
  • Classical trajectories
  • Continuum
  • Dimers
  • Resonator spectroscopy
  • Rototranslational band

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