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Tchana Betnga W, Hindle F, Manceron L, Vander Auwera J, Cuisset A, Mouret G, Bocquet R, Perrin A, Roy P, Kwabia Tchana F. A new instrumentation for simultaneous terahertz and mid-infrared spectroscopy in corrosive gaseous mixtures. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:015114. [PMID: 38276899 DOI: 10.1063/5.0178449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 01/03/2024] [Indexed: 01/27/2024]
Abstract
The correct interpretation of infrared (IR) observations of planetary atmospheres requires an accurate knowledge of temperature and partial and global pressures. Precise laboratory measurements of absorption intensities and line profiles, in the 200-350 K temperature range, are, therefore, critical. However, for gases only existing in complex chemical equilibria, such as nitrous or hypobromous acids, it is not possible to rely on absolute pressure measurements to measure absolute integrated optical absorption cross sections or IR line intensities. To overcome this difficulty, a novel dual-beam terahertz (THz)/mid-IR experimental setup has been developed, relying on the simultaneous use of two instruments. The setup involves a newly constructed temperature-controlled (200-350 K) cross-shaped absorption cell made of inert materials. The cell is traversed by the mid-IR beam from a high-resolution Fourier transform spectrometer using along a White-cell optical configuration providing absorption path lengths from 2.8 to 42 m and by a THz radiation beam (82.5 GHz to 1.1 THz), probing simultaneously the same gaseous sample. The THz channel records pure rotational lines of molecules for which the dipole moment was previously measured with high precision using Stark spectroscopy. This allows for a determination of the partial pressure in the gaseous mixture and enables absolute line intensities to be retrieved for the mid-IR range. This new instrument opens a new possibility for the retrieval of spectroscopic parameters for unstable molecules of atmospheric interest. The design and performance of the equipment are presented and illustrated by an example of simultaneous THz and mid-IR measurement on nitrous acid (HONO) equilibrium.
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Affiliation(s)
- W Tchana Betnga
- Université Paris Cité and Univ Paris Est Créteil, CNRS, LISA, F-75013 Paris, France
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France
| | - F Hindle
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France
| | - L Manceron
- Université Paris Cité and Univ Paris Est Créteil, CNRS, LISA, F-75013 Paris, France
- Synchrotron SOLEIL, Ligne AILES, L'Orme des Merisiers, St-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France
| | - J Vander Auwera
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), C.P. 160/09, Université Libre de Bruxelles, 50 Avenue F.D. Roosevelt, B-1050 Brussels, Belgium
| | - A Cuisset
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France
| | - G Mouret
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France
| | - R Bocquet
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France
| | - A Perrin
- Laboratoire de Météorologie Dynamique/IPSL, UMR CNRS 8539, Ecole Polytechnique, Université Paris-Saclay, RD36, 91128 Palaiseau Cedex, France
| | - P Roy
- Synchrotron SOLEIL, Ligne AILES, L'Orme des Merisiers, St-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France
| | - F Kwabia Tchana
- Université Paris Cité and Univ Paris Est Créteil, CNRS, LISA, F-75013 Paris, France
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Armante R, Perrin A, Kwabia Tchana F, Manceron L. The ν4 bands at 11 µm: linelists for the Trans- and Cis- conformer forms of nitrous acid (HONO) in the 2019 version of the GEISA database*. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1951860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- R. Armante
- Laboratoire de Météorologie Dynamique/IPSL, UMR CNRS 8539, Ecole Polytechnique, Université Paris-Saclay, Palaiseau Cedex, France
| | - A. Perrin
- Laboratoire de Météorologie Dynamique/IPSL, UMR CNRS 8539, Ecole Polytechnique, Université Paris-Saclay, Palaiseau Cedex, France
| | - F. Kwabia Tchana
- Université de Paris and Univ Paris Est Creteil, CNRS, LISA, Paris, France
| | - L. Manceron
- Ligne AILES, Synchrotron SOLEIL, Gif-sur-Yvette Cedex, France
- Sorbonne Université, CNRS, MONARIS, UMR 8233, Paris, France
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Raston PL, Kelloway DD, Jäger W. Infrared spectroscopy of HOCl embedded in superfluid helium nanodroplets: Probing the dynamical response of the solvent. J Chem Phys 2012; 137:014302. [DOI: 10.1063/1.4731283] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Martin-Drumel MA, Pirali O, Balcon D, Bréchignac P, Roy P, Vervloet M. High resolution far-infrared Fourier transform spectroscopy of radicals at the AILES beamline of SOLEIL synchrotron facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:113106. [PMID: 22128965 DOI: 10.1063/1.3660809] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Experimental far-infrared (FIR) spectroscopy of transient species (unstable molecules, free radicals, and ions) has been limited so far in both emission and absorption (mainly by the low probability of spontaneous emission in that spectral range and the low brightness of continuum sources used for absorption measurements, respectively). Nevertheless, the FIR spectral range recently became of high astrophysical relevance thanks to several new observational platforms (HERSCHEL, ALMA...) dedicated to the study of this region suitable for the detection of the emission from cold objects of the interstellar medium. In order to complete the experimental dataset concerning transient species, three discharge experiments dedicated to the recording of high resolution FIR spectra of radicals have been developed at the Advanced Infrared Line Exploited for Spectroscopy (AILES) which extracts the bright FIR synchrotron continuum of the synchrotron facility SOLEIL. These experiments make use of a high resolution (R = 0.001 cm(-1)) Bruker IFS125 Fourier transform (FT) spectrometer. An emission setup (allowing to record spectra of radicals excited at high rotational and vibrational temperatures) and two absorption setups (exploiting the bright synchrotron source at the highest resolution available on the FT) are alternatively connected to the FT. The advantages and limitations of these techniques are discussed on the basis of the recent results obtained on OH and CH radicals. These results constitute the first FIR spectra of radicals using synchrotron radiation, and the first FIR spectrum of a C-bearing radical using FT-spectroscopy.
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Affiliation(s)
- M A Martin-Drumel
- Institut des Sciences Moléculaires (ISMO), CNRS, Université Paris XI, ba^t. 210, 91405 Orsay Cedex, France.
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Alkorta I, Blanco F, Solimannejad M, Elguero J. Competition of hydrogen bonds and halogen bonds in complexes of hypohalous acids with nitrogenated bases. J Phys Chem A 2008; 112:10856-63. [PMID: 18837495 DOI: 10.1021/jp806101t] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A theoretical study of the complexes formed by hypohalous acids (HOX, X = F, Cl, Br, I, and At) with three nitrogenated bases (NH 3, N 2, and NCH) has been carried out by means of ab initio methods, up to MP2/aug-cc-pVTZ computational method. In general, two minima complexes are found, one with an OH...N hydrogen bond and the other one with a X...N halogen bond. While the first one is more stable for the smallest halogen derivatives, the two complexes present similar stabilities for the iodine case and the halogen-bonded structure is the most stable one for the hypoastatous acid complexes.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Quimica Medica (CSIC), Juan de la Cierva, 3; 28006-Madrid, Spain.
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Vander Auwera J, Didriche K, Perrin A, Keller F. Absolute line intensities for formic acid and dissociation constant of the dimer. J Chem Phys 2007; 126:124311. [PMID: 17411127 DOI: 10.1063/1.2712439] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Absolute line intensities in the nu(6) and nu(8) interacting bands of trans-HCOOH, observed near 1105.4 and 1033.5 cm(-1), respectively, and the dissociation constant of the formic acid dimer (HCOOH)(2) have been measured using Fourier transform spectroscopy at a resolution of 0.002 cm(-1). Eleven spectra of formic acid, at 296.0(5) K and pressures ranging from 14.28(25) to 314.0(24) Pa, have been recorded between 600 and 1900 cm(-1) with an absorption path length of 19.7(2) cm. 437 integrated absorption coefficients have been measured for 72 lines in the nu(6) band. Analysis of the pressure dependence yielded the dissociation constant of the formic acid dimer, K(p)=361(45) Pa, and the absolute intensity of the 72 lines of HCOOH. The accuracy of these results was carefully estimated. The absolute intensities of four lines of the weak nu(8) band were also measured. Using an appropriate theory, the integrated intensity of the nu(6) and nu(8) bands was determined to be 3.47 x 10(-17) and 4.68 x 10(-19) cm(-1)(molecule cm(-2)) respectively, at 296 K. Both the dissociation constant and integrated intensities were compared to earlier measurements.
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Affiliation(s)
- J Vander Auwera
- Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium.
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