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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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Čermák P, Vasilchenko S, Mondelain D, Kassi S, Campargue A. First laboratory detection of an absorption line of the first overtone electric quadrupolar band of N2 by CRDS near 2.2 μm. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.11.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Čermák P, Chomet B, Ferrieres L, Vasilchenko S, Mondelain D, Kassi S, Campargue A, Denet S, Lecocq V, Myara M, Cerutti L, Garnache A. CRDS with a VECSEL for broad-band high sensitivity spectroscopy in the 2.3 μm window. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:083109. [PMID: 27587102 DOI: 10.1063/1.4960769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The integration of an industry ready packaged Sb-based Vertical-External-Cavity Surface-Emitting-Laser (VECSEL) into a Cavity Ring Down Spectrometer (CRDS) is presented. The instrument operates in the important 2.3 μm atmospheric transparency window and provides a high sensitivity (minimum detectable absorption of 9 × 10(-11) cm(-1)) over a wide spectra range. The VECSEL performances combine a large continuous tunability over 120 cm(-1) around 4300 cm(-1) together with a powerful (∼5 mW) TEM00 diffraction limited beam and linewidth at MHz level (for 1 ms of integration time). The achieved performances are illustrated by high sensitivity recordings of the very weak absorption spectrum of water vapor in the region. The developed method gives potential access to the 2-2.7 μm range for CRDS.
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Affiliation(s)
- P Čermák
- University Grenoble Alpes, LIPhy, F-38000 Grenoble, France
| | - B Chomet
- IES, CNRS, UMR5214, University Montpellier, F-34000 Montpellier, France
| | - L Ferrieres
- Innoptics, Institut d'Optique d'Aquitaine Rue François Mitterrand, 33400 Talence, France
| | - S Vasilchenko
- University Grenoble Alpes, LIPhy, F-38000 Grenoble, France
| | - D Mondelain
- University Grenoble Alpes, LIPhy, F-38000 Grenoble, France
| | - S Kassi
- University Grenoble Alpes, LIPhy, F-38000 Grenoble, France
| | - A Campargue
- University Grenoble Alpes, LIPhy, F-38000 Grenoble, France
| | - S Denet
- Innoptics, Institut d'Optique d'Aquitaine Rue François Mitterrand, 33400 Talence, France
| | - V Lecocq
- Innoptics, Institut d'Optique d'Aquitaine Rue François Mitterrand, 33400 Talence, France
| | - M Myara
- IES, CNRS, UMR5214, University Montpellier, F-34000 Montpellier, France
| | - L Cerutti
- IES, CNRS, UMR5214, University Montpellier, F-34000 Montpellier, France
| | - A Garnache
- IES, CNRS, UMR5214, University Montpellier, F-34000 Montpellier, France
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Ventrillard I, Romanini D, Mondelain D, Campargue A. Accurate measurements and temperature dependence of the water vapor self-continuum absorption in the 2.1 μm atmospheric window. J Chem Phys 2016; 143:134304. [PMID: 26450311 DOI: 10.1063/1.4931811] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
In spite of its importance for the evaluation of the Earth radiative budget, thus for climate change, very few measurements of the water vapor continuum are available in the near infrared atmospheric windows especially at temperature conditions relevant for our atmosphere. In addition, as a result of the difficulty to measure weak broadband absorption signals, the few available measurements show large disagreements. We report here accurate measurements of the water vapor self-continuum absorption in the 2.1 μm window by Optical Feedback Cavity Enhanced Absorption Spectroscopy (OF-CEAS) for two spectral points located at the low energy edge and at the center of the 2.1 μm transparency window, at 4302 and 4723 cm(-1), respectively. Self-continuum cross sections, CS, were retrieved with a few % relative uncertainty, from the quadratic dependence of the spectrum base line level measured as a function of water vapor pressure, between 0 and 16 Torr. At 296 K, the CS value at 4302 cm(-1) is found 40% higher than predicted by the MT_CKD V2.5 model, while at 4723 cm(-1), our value is 5 times larger than the MT_CKD value. On the other hand, these OF-CEAS CS values are significantly smaller than recent measurements by Fourier transform spectroscopy at room temperature. The temperature dependence of the self-continuum cross sections was also investigated for temperatures between 296 K and 323 K (23-50 °C). The derived temperature variation is found to be similar to that derived from previous Fourier transform spectrometer (FTS) measurements performed at higher temperatures, between 350 K and 472 K. The whole set of measurements spanning the 296-472 K temperature range follows a simple exponential law in 1/T with a slope close to the dissociation energy of the water dimer, D0 ≈ 1100 cm(-1).
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Affiliation(s)
- I Ventrillard
- LIPhy, Université Grenoble Alpes, F-38000 Grenoble, France
| | - D Romanini
- LIPhy, Université Grenoble Alpes, F-38000 Grenoble, France
| | - D Mondelain
- LIPhy, Université Grenoble Alpes, F-38000 Grenoble, France
| | - A Campargue
- LIPhy, Université Grenoble Alpes, F-38000 Grenoble, France
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