1. CO2–CO2 and CO2–Ar continua at millimeter wavelengths
- Author
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Artem A. Finenko, A.A. Vigasin, A.O. Koroleva, S.E. Lokshtanov, N. N. Filippov, Anna A. Simonova, A.A. Balashov, S.V. Petrov, M.Yu. Tretyakov, M.A. Koshelev, Daniil N. Chistikov, T.A. Odintsova, and E. A. Serov
- Subjects
Radiation ,Materials science ,010504 meteorology & atmospheric sciences ,Spectrometer ,Continuum (measurement) ,Semiclassical physics ,Frequency dependence ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Spectral line ,Resonator ,Wavelength ,Millimeter ,Atomic physics ,Spectroscopy ,0105 earth and related environmental sciences - Abstract
Broadband spectra of the continuum absorption in pure CO 2 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 CO 2 –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.
- Published
- 2021
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