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Galanina TA, Koroleva AO, Amerkhanov IS, Serov EA, Koshelev MA, Tretyakov MY, Chistikov DN, Finenko AA, Vigasin AA. On the nature of sub-THz continuum absorption in CO 2 gas, its mixture with Ar, and in pure water vapor. Phys Chem Chem Phys 2024; 26:15032-15043. [PMID: 38742911 DOI: 10.1039/d4cp00240g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Detailed analysis of the unique broadband millimeter-wave (70-360 GHz) collision-induced absorption spectra in pure CO2 and in its mixture with Ar is presented. The nature of the observed continuum absorption is examined using classical trajectory simulation along with statistical physics consideration. Bimolecular continuum is decomposed in the phase space into separate contributions from the so-called free, quasibound, and true bound molecular pairs, the proportions of which greatly vary with temperature. This partitioning is supported by consideration of the second virial coefficient and excluded volume in pure CO2, Ar, and CO2-Ar. Close similarity between collision-induced absorption in the CO2 containing gases and the water vapor continuum in the subterahertz spectral range is demonstrated. This similarity suggests that the physical principles underlying both continuum absorption phenomena have much in common and, therefore, can be used for continuum modeling.
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Affiliation(s)
- T A Galanina
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - A O Koroleva
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - I S Amerkhanov
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - E A Serov
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - M A Koshelev
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - M Yu Tretyakov
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
| | - D N Chistikov
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
- A. M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, 3 Pyzhevsky Per., Moscow 119017, Russia
- Department of Chemistry, Lomonosov Moscow State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
- Institute of Quantum Physics, Irkutsk National Research Technical University, 83 Lermontov str., Irkutsk 664074, Russia
| | - A A Finenko
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
- Department of Chemistry, Lomonosov Moscow State University, GSP-1, 1-3 Leninskiye Gory, Moscow 119991, Russia
- Institute of Quantum Physics, Irkutsk National Research Technical University, 83 Lermontov str., Irkutsk 664074, Russia
| | - A A Vigasin
- A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., Nyzhny Novgorod 603950, Russia.
- A. M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, 3 Pyzhevsky Per., Moscow 119017, Russia
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