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Caviezel M, Horká-Zelenková V, Seyfang G, Quack M. High resolution FTIR and diode laser spectroscopy of trifluoromethylacetylene and tetrafluoromethane in a supersonic jet expansion. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2093285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- M. Caviezel
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | | | - G. Seyfang
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | - M. Quack
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
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2
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Agner JA, Albert S, Allmendinger P, Hollenstein U, Hugi A, Jouy P, Keppler K, Mangold M, Merkt F, Quack M. High-resolution spectroscopic measurements of cold samples in supersonic beams using a QCL dual-comb spectrometer*. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2094297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Josef A. Agner
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | - Sieghard Albert
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | | | - Urs Hollenstein
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | | | | | - Karen Keppler
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | | | - Frédéric Merkt
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | - Martin Quack
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
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Rey M, Chizhmakova IS, Nikitin AV, Tyuterev VG. Understanding global infrared opacity and hot bands of greenhouse molecules with low vibrational modes from first-principles calculations: the case of CF 4. Phys Chem Chem Phys 2018; 20:21008-21033. [PMID: 30070661 DOI: 10.1039/c8cp03252a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorine containing molecules have a particularly long atmospheric lifetime and their very big estimated global warming potentials are expected to rapidly increase in the future. This work is focused on the global theoretical prediction of infrared spectra of the tetrafluoromethane molecule that is considered as a potentially powerful greenhouse gas having the largest estimated lifetime of over 50 000 years in the atmosphere. The presence of relatively low vibrational frequencies makes the Boltzmann population of the excited levels important. Consequently, the "hot bands" corresponding to transitions among excited rovibrational states contribute significantly to the CF4 opacity in the infrared even at room temperature conditions but the existing laboratory data analyses are not sufficiently complete. In this work, we construct the first accurate and complete ab initio based line lists for CF4 in the range 0-4000 cm-1, containing rovibrational bands that are the most active in absorption. An efficient basis set compression method was applied to predict more than 700 new bands and subbands via variational nuclear motion calculations. We show that already at room temperature a quasi-continuum of overlapping weak lines appears in the CF4 infrared spectra due to the increasing density of bands and transitions. In order to converge the infrared opacity at room temperature, it was necessary to include a high rotational quantum number up to J = 80 resulting in 2 billion rovibrational transitions. In order to make the cross-section simulation faster, we have partitioned our data into two parts: (a) strong & medium line lists with lower energy levels for calculation of selective absorption features that can be used at various temperatures and (b) compressed "super-line" libraries of very weak transitions contributing to the quasi-continuum modelling. Comparisons with raw previously unassigned experimental spectra showed a very good accuracy for integrated absorbance in the entire range of the reported spectra predictions. The data obtained in this work will be made available through the TheoReTS information system (http://theorets.univ-reims.fr, http://theorets.tsu.ru) that contains ab initio born line lists and provides a user-friendly graphical interface for a fast simulation of the CF4 absorption cross-sections and radiance under various temperature conditions from 80 K to 400 K.
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Affiliation(s)
- Michaël Rey
- Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 7331, BP 1039, F-51687, Reims Cedex 2, France.
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Yang L, Lin H, Feng XJ, Zhang JT. Temperature-scanning saturation cavity ring-down spectrometry for Doppler-free spectroscopy. OPTICS EXPRESS 2018; 26:10203-10210. [PMID: 29715960 DOI: 10.1364/oe.26.010203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 04/03/2018] [Indexed: 06/08/2023]
Abstract
Saturation cavity ring-down spectroscopy (SCRDS) is a powerful Doppler-free spectroscopy means for measuring absolute frequencies of transitions at the ultra-low uncertainties. We report in this paper a simple way to implement it by temperature scanning the cavity length, which circumvents the need for a complex optical cavity-length stabilization system based upon a piezoelectric actuator (PZT). To demonstrate this approach, the absolute frequencies of the two transitions, R6F1 of the 2v3 and Q9A1 of the 2v2 + v3 bands, of 12CH4, are determined to be 182 185 269.362(20) MHz and 182 187 617.543(39) MHz. The accuracy of measurements is improved by about 3-4 orders of magnitude when compared to those obtained with conventional spectroscopic methods.
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Boudon V, Lamy M, Dugue-Boyé F, Pirali O, Gruet S, D'Accolti L, Fusco C, Annese C, Alikhani ME. Synthesis, High-Resolution Infrared Spectroscopy, and Vibrational Structure of Cubane, C8H8. J Phys Chem A 2016; 120:4418-28. [PMID: 27267150 DOI: 10.1021/acs.jpca.6b04323] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Carbon-cage molecules have generated a considerable interest from both experimental and theoretical points of view. We recently performed a high-resolution study of adamantane (C10H16), the smallest hydrocarbon cage belonging to the diamandoid family ( Pirali , O. ; et al. J. Chem. Phys. 2012 , 136 , 024310 ). There exist another family of hydrocarbon cages with additional interesting chemical properties: the so-called platonic hydrocarbons that comprise dodecahedrane (C20H20) and cubane (C8H8). Both possess C-C bond angles that deviate from the tetrahedral angle (109.8°) of the sp(3) hybridized form of carbon. This generates a considerable strain in the molecule. We report a new wide-range high-resolution study of the infrared spectrum of cubane. The sample was synthesized in Bari upon decarboxylation of 1,4-cubanedicarboxylic acid thanks to the improved synthesis of literature. Several spectra have been recorded at the AILES beamline of the SOLEIL synchrotron facility. They cover the 600-3200 cm(-1) region. Besides the three infrared-active fundamentals (ν10, ν11, and ν12), we could record many combination bands, all of them displaying a well-resolved octahedral rotational structure. We present here a preliminary analysis of some of the recorded bands, performed thanks the SPVIEW and XTDS software, based on the tensorial formalism developed in the Dijon group. A comparison with ab initio calculations, allowing to identify some combination bands, is also presented.
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Affiliation(s)
- V Boudon
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté , 9 avenue Alain Savary, BP 47870, F-21078 Dijon Cedex, France
| | - M Lamy
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté , 9 avenue Alain Savary, BP 47870, F-21078 Dijon Cedex, France
| | - F Dugue-Boyé
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté , 9 avenue Alain Savary, BP 47870, F-21078 Dijon Cedex, France
| | - O Pirali
- Ligne AILES - Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France and Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - S Gruet
- Ligne AILES - Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France and Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - L D'Accolti
- Dipartimento di Chimica, Università di Bari A. Moro , I-70126 Bari, Italy.,Istituto di Chimica dei Composti Organometallici ICCOM , Bari Sect, I-70126 Bari, Italy
| | - C Fusco
- Dipartimento di Chimica, Università di Bari A. Moro , I-70126 Bari, Italy.,Istituto di Chimica dei Composti Organometallici ICCOM , Bari Sect, I-70126 Bari, Italy
| | - C Annese
- Dipartimento di Chimica, Università di Bari A. Moro , I-70126 Bari, Italy.,Istituto di Chimica dei Composti Organometallici ICCOM , Bari Sect, I-70126 Bari, Italy
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Lüttschwager NOB, Suhm MA. Stretching and folding of 2-nanometer hydrocarbon rods. SOFT MATTER 2014; 10:4885-4901. [PMID: 24866111 DOI: 10.1039/c4sm00508b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Linear alkanes CnH2n+2 in vacuum isolation are finite models for an infinite polyethylene chain. Using spontaneous Raman scattering in supersonic jet expansions for n = 13-21 in different spectral ranges, we determine the minimal chain length nh for the cohesion-driven folding of the preferred extended all-trans conformation into a hairpin structure. We treat fully stretched all-trans alkanes as molecular "nanorods" and derive Young's modulus E for the stretching of an isolated single-strand polyethylene fibre by extrapolating the longitudinal acoustic mode to infinite chain length. Two key quality parameters for accurate intra- and intermolecular force fields of hydrocarbons (nh = 18 ± 1, E = 305 ± 5 GPa) are thus derived with high accuracy from experimental spectroscopy.
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Affiliation(s)
- Nils O B Lüttschwager
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstr. 6, 37077 Göttingen, Germany.
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de Ghellinck d’Elseghem Vaernewijck X, Golebiowski D, Herman M. Femto-Fourier transform-cavity enhanced absorption spectroscopy in a supersonic expansion. Mol Phys 2012. [DOI: 10.1080/00268976.2012.701342] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - D. Golebiowski
- a Chimie quantique et Photophysique CP160/09, Université Libre de Bruxelles , Bruxelles , Belgium
| | - M. Herman
- a Chimie quantique et Photophysique CP160/09, Université Libre de Bruxelles , Bruxelles , Belgium
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