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Lüttschwager NOB. The strength of the OH-bend/OH-stretch Fermi resonance in small water clusters. Phys Chem Chem Phys 2024; 26:10120-10135. [PMID: 38487881 DOI: 10.1039/d3cp06255d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
A novel Raman jet-spectrometer is used to study the Fermi resonance between the OH bending overtone and OH stretching fundamental in small cyclic water clusters (H2O)n with n = 3, 4, 5. The new setup features a recirculating vacuum system which reduces the gas consumption by 2 to 3 orders of magnitude and enables long-term measurements of very weak Raman signals. Raman spectra measured from highly diluted expansions with unprecedented signal-to-noise ratio are presented and cluster-specific intensity ratios and effective coupling constants are derived using Markov-Chain Monte-Carlo methods, yielding a high probability for an almost "perfect" resonance for the tetramer and pentamer, i.e. a close frequency match of bend overtone and stretch fundamental with intensity ratios close to 1, but a larger coupling constant for the trimer, with best estimates close to W5 ≲ 50 cm-1 < W4 ≲ 60 cm-1 < W3 ≈ 65 cm-1.
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Affiliation(s)
- Nils O B Lüttschwager
- Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstraße 6, 37077 Göttingen, Germany.
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Dudás E, Suas-David N, Brahmachary S, Kulkarni V, Benidar A, Kassi S, Charles C, Georges R. High-temperature hypersonic Laval nozzle for non-LTE cavity ringdown spectroscopy. J Chem Phys 2020; 152:134201. [PMID: 32268744 DOI: 10.1063/5.0003886] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A small dimension Laval nozzle connected to a compact high enthalpy source equipped with cavity ringdown spectroscopy (CRDS) is used to produce vibrationally hot and rotationally cold high-resolution infrared spectra of polyatomic molecules in the 1.67 µm region. The Laval nozzle was machined in isostatic graphite, which is capable of withstanding high stagnation temperatures. It is characterized by a throat diameter of 2 mm and an exit diameter of 24 mm. It was designed to operate with argon heated up to 2000 K and to produce a quasi-unidirectional flow to reduce the Doppler effect responsible for line broadening. The hypersonic flow was characterized using computational fluid dynamics simulations, Pitot measurements, and CRDS. A Mach number evolving from 10 at the nozzle exit up to 18.3 before the occurrence of a first oblique shock wave was measured. Two different gases, carbon monoxide (CO) and methane (CH4), were used as test molecules. Vibrational (Tvib) and rotational (Trot) temperatures were extracted from the recorded infrared spectrum, leading to Tvib = 1346 ± 52 K and Trot = 12 ± 1 K for CO. A rotational temperature of 30 ± 3 K was measured for CH4, while two vibrational temperatures were necessary to reproduce the observed intensities. The population distribution between vibrational polyads was correctly described with Tvib I=894±47 K, while the population distribution within a given polyad (namely, the dyad or the pentad) was modeled correctly by Tvib II=54±4 K, testifying to a more rapid vibrational relaxation between the vibrational energy levels constituting a polyad.
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Affiliation(s)
- Eszter Dudás
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - Nicolas Suas-David
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - Shuvayan Brahmachary
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Vinayak Kulkarni
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Abdessamad Benidar
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - Samir Kassi
- Université Grenoble Alpes, LIPhy, F-38000 Grenoble, France and CNRS, LIPhy, F-38000 Grenoble, France
| | - Christine Charles
- Space Plasma, Power and Propulsion Laboratory (SP3), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Robert Georges
- Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
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Suas-David N, Thawoos S, Suits AG. A uniform flow-cavity ring-down spectrometer (UF-CRDS): A new setup for spectroscopy and kinetics at low temperature. J Chem Phys 2019; 151:244202. [PMID: 31893907 DOI: 10.1063/1.5125574] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The UF-CRDS (Uniform Flow-Cavity Ring Down Spectrometer) is a new setup coupling for the first time a pulsed uniform (Laval) flow with a continuous wave CRDS in the near infrared for spectroscopy and kinetics at low temperature. This high resolution and sensitive absorption spectrometer opens a new window into the phenomena occurring within UFs. The approach extends the detection range to new electronic and rovibrational transitions within Laval flows and offers the possibility to probe numerous species which have not been investigated yet. This new tool has been designed to probe radicals and reaction intermediates but also to follow the chemistry of hydrocarbon chains and PAHs which play a crucial role in the evolution of astrophysical environments. For kinetics measurements, the UF-CRDS combines the CRESU technique (French acronym meaning reaction kinetics in uniform supersonic flows) with the SKaR (Simultaneous Kinetics and Ring-Down) approach where, as indicated by its name, the entire reaction is monitored during each intensity decay within the high finesse cavity. The setup and the approach are demonstrated with the study of the reaction between CN (v = 1) and propene at low temperature. The recorded data are finally consistent with a previous study of the same reaction for CN (v = 0) relying on the CRESU technique with laser induced fluorescence detection.
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Affiliation(s)
- N Suas-David
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | - S Thawoos
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | - A G Suits
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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He Y, Ma Y, Tong Y, Yu X, Tittel FK. Ultra-high sensitive light-induced thermoelastic spectroscopy sensor with a high Q-factor quartz tuning fork and a multipass cell. OPTICS LETTERS 2019; 44:1904-1907. [PMID: 30985771 DOI: 10.1364/ol.44.001904] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/09/2019] [Indexed: 05/23/2023]
Abstract
An ultra-high sensitive light-induced thermoelastic spectroscopy (LITES) sensor based on a resonant high Q-factor quartz turning fork (QTF) and a Herriot multipass cell was demonstrated for the first time, to the best of our knowledge. The performance of LITES and widely used tunable diode laser absorption spectroscopy (TDLAS) were experimentally investigated and compared at the same conditions. Carbon monoxide (CO) was chosen as the analyte to verify the reported sensors' performance. With a minimum detection limit (MDL) of 470 ppb for 60 ms integration time and a noise equivalent absorption (NEA) coefficient of 2.0×10-7 cm-1 Hz-1/2, and a MDL of 17 ppb with an optimum integration time of 800 s, the reported LITES sensor showed a superior sensing capability compared with a TDLAS sensor and a conventional quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor.
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Amyay B, Gardez A, Georges R, Biennier L, Vander Auwera J, Richard C, Boudon V. New investigation of the ν 3 C-H stretching region of 12CH 4 through the analysis of high temperature infrared emission spectra. J Chem Phys 2018; 148:134306. [PMID: 29626915 DOI: 10.1063/1.5023331] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ν3 C-H stretching region of methane was reinvestigated in this work using high temperature (620-1715 K) emission spectra recorded in Rennes at Doppler limited resolution. This work follows our recent global analysis of the Dyad system Δn = ±1 (1000-1500 cm-1), with n being the polyad number [B. Amyay et al., J. Chem. Phys. 144, 24312 (2016)]. Thanks to the high temperature, new assignments of vibration-rotation methane line positions have been achieved successfully in the Pentad system and some associated hot bands (Δn = ±2) observed in the spectral region 2600-3300 cm-1. In particular, rotational assignments in the cold band [Pentad-ground state (GS)] and in the first related hot band (Octad-Dyad) were extended up to J = 30 and 27, respectively. In addition, 1525 new transitions belonging to the Tetradecad-Pentad hot band system were assigned for the first time, up to J = 20. The effective global model used to deal with the new assignments was developed to the 6th order for the first three polyads (Monad, Dyad, and Pentad), and to the 5th order for both the Octad and the Tetradecad. 1306 effective parameters were fitted with a dimensionless standard deviation σ = 2.64. The root mean square deviations dRMS obtained are 4.18 × 10-3 cm-1 for the Pentad-GS cold band, 2.48 × 10-3 cm-1 for the Octad-Dyad, and 1.43 × 10-3 cm-1 for the Tetradecad-Pentad hot bands.
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Affiliation(s)
- Badr Amyay
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 Avenue A. Savary, BP 47870, 21078 Dijon Cedex, France
| | - Aline Gardez
- Institut de Physique de Rennes, UMR 6251, Campus de Beaulieu, Université de Rennes 1/CNRS, F-35042 Rennes Cedex, France
| | - Robert Georges
- Institut de Physique de Rennes, UMR 6251, Campus de Beaulieu, Université de Rennes 1/CNRS, F-35042 Rennes Cedex, France
| | - Ludovic Biennier
- Institut de Physique de Rennes, UMR 6251, Campus de Beaulieu, Université de Rennes 1/CNRS, F-35042 Rennes Cedex, France
| | - Jean Vander Auwera
- Service de Chimie Quantique et Photophysique, C.P. 160/09, Université Libre de Bruxelles, 50 Avenue F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Cyril Richard
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 Avenue A. Savary, BP 47870, 21078 Dijon Cedex, France
| | - Vincent Boudon
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 Avenue A. Savary, BP 47870, 21078 Dijon Cedex, France
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Line shape in a free-jet hypersonic expansion investigated by cavity ring-down spectroscopy and computational fluid dynamics. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.06.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Talicska CN, Porambo MW, Perry AJ, McCall BJ. Mid-infrared concentration-modulated noise-immune cavity-enhanced optical heterodyne molecular spectroscopy of a continuous supersonic expansion discharge source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:063111. [PMID: 27370430 DOI: 10.1063/1.4953652] [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
Concentration-modulated noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is implemented for the first time on a continuous gas-flow pinhole supersonic expansion discharge source for the study of cooled molecular ions. The instrument utilizes a continuous-wave optical parametric oscillator easily tunable from 2.5 to 3.9 μm and demonstrates a noise equivalent absorption of ∼1 × 10(-9) cm(-1). The effectiveness of concentration-modulated NICE-OHMS is tested through the acquisition of transitions in the ν1 fundamental band of HN2 (+) centered near 3234 cm(-1), with a signal-to-noise of ∼40 obtained for the strongest transitions. The technique is used to characterize the cooling abilities of the supersonic expansion discharge source itself, and a Boltzmann analysis determines a rotational temperature of ∼29 K for low rotational states of HN2 (+). Further improvements are discussed that will enable concentration-modulated NICE-OHMS to reach its full potential for the detection of molecular ions formed in supersonic expansion discharges.
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Affiliation(s)
- Courtney N Talicska
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Michael W Porambo
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Adam J Perry
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Benjamin J McCall
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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Herman M, Földes T, Didriche K, Lauzin C, Vanfleteren T. Overtone spectroscopy of molecular complexes containing small polyatomic molecules. INT REV PHYS CHEM 2016. [DOI: 10.1080/0144235x.2016.1171039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Dobrev G, Morville J, Tokaryk DW, Ross AJ, Crozet P. A CRDS sputter-source experiment to study MH radicals: application to NiH and NiD. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1171918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- G. Dobrev
- ILM Institut Lumière Matière, Université Claude Bernard Lyon 1, Université de Lyon, Villeurbanne, France
- Department of Optics and Spectroscopy, Sofia University, Sofia, Bulgaria
| | - J. Morville
- ILM Institut Lumière Matière, Université Claude Bernard Lyon 1, Université de Lyon, Villeurbanne, France
| | - D. W. Tokaryk
- Department of Physics, University of New Brunswick, Fredericton, NB, Canada
| | - A. J. Ross
- ILM Institut Lumière Matière, Université Claude Bernard Lyon 1, Université de Lyon, Villeurbanne, France
| | - P. Crozet
- ILM Institut Lumière Matière, Université Claude Bernard Lyon 1, Université de Lyon, Villeurbanne, France
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Suas-David N, Vanfleteren T, Földes T, Kassi S, Georges R, Herman M. The Water Dimer Investigated in the 2OH Spectral Range Using Cavity Ring-Down Spectroscopy. J Phys Chem A 2015; 119:10022-34. [DOI: 10.1021/acs.jpca.5b06746] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Suas-David
- Institut
de Physique de Rennes, UMR 6251, Campus de Beaulieu,
Bât. 11C, Université de Rennes 1/CNRS, F-35042 Rennes
Cedex, France
| | - T. Vanfleteren
- Laboratoire
de Chimie quantique et Photophysique, CP160/09 Faculté des
Sciences, Université Libre de Bruxelles, 50, ave. Roosevelt, B-1050 Bruxelles, Belgium
| | - T. Földes
- Laboratoire
de Chimie quantique et Photophysique, CP160/09 Faculté des
Sciences, Université Libre de Bruxelles, 50, ave. Roosevelt, B-1050 Bruxelles, Belgium
| | - S. Kassi
- Laboratoire
Interdisciplinaire de Physique, UMR 5588, Université de Grenoble Alpes/CNRS, F-38041 Grenoble, France
| | - R. Georges
- Institut
de Physique de Rennes, UMR 6251, Campus de Beaulieu,
Bât. 11C, Université de Rennes 1/CNRS, F-35042 Rennes
Cedex, France
| | - M. Herman
- Laboratoire
de Chimie quantique et Photophysique, CP160/09 Faculté des
Sciences, Université Libre de Bruxelles, 50, ave. Roosevelt, B-1050 Bruxelles, Belgium
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