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Mehnen B, Linguerri R, Ben Yaghlane S, Al Mogren MM, Hochlaf M. Disentangling the complex spectrum of the ethynyl cation. Faraday Discuss 2018; 212:51-64. [PMID: 30234210 DOI: 10.1039/c8fd00091c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ethynyl cation, C2H+, is of great importance in astrophysical media and in combustion. It is involved in the formation of larger organic compounds and in their decomposition mechanisms. Here, we investigate the low-lying electronic states of this cation using pure ab initio methodologies. The evolution of its potential energy surfaces along the stretching and bending coordinates reveals a high density of electronic states that favours mutual interactions and the mixing of wavefunctions. The ground state is of 3Π space symmetry and the lowest singlet state (1Π) is found to be a quasi-linear-quasi-linear Renner-Teller system. Our work suggests that the (spin-)rovibronic spectrum of such a molecular system is complicated, because of the contributions of multiple couplings, including Renner-Teller, vibronic and spin-orbit. We also deduced the adiabatic ionization energy of the ethynyl radical, in good agreement with recent measurements. In summary, our work shows that the ethynyl cation, in spite of its small size, still represents a challenging molecular problem to be solved.
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Affiliation(s)
- B Mehnen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France. and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - R Linguerri
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
| | - S Ben Yaghlane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - M Mogren Al Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - M Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
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Feller D. Estimating the intrinsic limit of the Feller-Peterson-Dixon composite approach when applied to adiabatic ionization potentials in atoms and small molecules. J Chem Phys 2017; 147:034103. [DOI: 10.1063/1.4993625] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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3
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Krechkivska O, Bacskay GB, Welsh BA, Nauta K, Kable SH, Stanton JF, Schmidt TW. The ionization energy of C2. J Chem Phys 2016; 144:144305. [DOI: 10.1063/1.4944932] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- O. Krechkivska
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - G. B. Bacskay
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - B. A. Welsh
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - K. Nauta
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - S. H. Kable
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - J. F. Stanton
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - T. W. Schmidt
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
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Sun YL, Huang WJ, Chin CH, Lee SH. Dynamics of the reaction of C2 with C6H2: an implication for the formation of interstellar C8H. J Chem Phys 2014; 141:194305. [PMID: 25416889 DOI: 10.1063/1.4901981] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The reaction C2 + C6H2 → C8H + H was investigated for the first time. Reactant C2 (C6H2) was synthesized from 1% C3F6/He (5% C2H2/He) by pulsed high-voltage discharge. We measured the translational-energy distribution, the angular distribution, and the photoionization spectrum of product C8H in a crossed molecular-beam apparatus using synchrotron vacuum-ultraviolet ionization. This reaction released average translational energy of 8.5 kcal mol(-1) corresponding to a fraction of 0.37 in translation. C8H was identified as octatetranyl based on the maximal translational-energy release 23 ± 2 kcal mol(-1) and the ionization threshold 8.9 ± 0.2 eV. Kinematic constraints can qualitatively account for the nearly isotropic angular distribution. The quantum-chemical calculations indicate that the exothermic reactions C2 (X (1)Σg (+)/a (3)Πu) + HC6H → C8H + H can proceed without entrance and exit barriers, implying the importance in the cold interstellar medium. This work verifies that interstellar C8H can be formed through the C2 + C6H2 reaction.
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Affiliation(s)
- Yi-Lun Sun
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Wen-Jian Huang
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Chih-Hao Chin
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
| | - Shih-Huang Lee
- National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan
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Tsipis AC. DFT assessment of the spectroscopic constants and absorption spectra of neutral and charged diatomic species of group 11 and 14 elements. J Comput Chem 2014; 35:1762-77. [PMID: 25043630 DOI: 10.1002/jcc.23684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 06/21/2014] [Accepted: 06/24/2014] [Indexed: 11/07/2022]
Abstract
The spectroscopic constants and absorption spectra of neutral and charged diatomic molecules of group 11 and 14 elements formulated as [M(2)](+/0/-) (M = Cu, Ag, Au), and [E(2)](+/0/-) (E = C, Si, Ge, Sn, Pb) have been calculated at the PBE0/Def2-QZVPP level of theory. The electronic and bonding properties of the diatomics have been analyzed by natural bond orbital analysis approach and topology analysis by the atoms in molecules method. Particular emphasis was given on the absorption spectra of the diatomic species, which were simulated by time-dependent density functional theory calculations employing the hybrid Coulomb-attenuating CAM-B3LYP density functional. The simulated absorption spectra of the [M(2)](+/0/-) (M = Cu, Ag, Au) and [E(2)](+/0/-) (E = C, Si, Ge, Sn, Pb) species are in close resemblance with the experimentally observed spectra whenever available. The neutral M(2) and E(2) diatomics strongly absorb in the ultraviolet region, given rise to UVC, UVA and in a few cases UVB absorptions. In a few cases, weak absorbion bands also occur in the visible region. The absorption bands have thoroughly been analyzed and assignments of the contributing principal electronic transitions associated to individual excitations have been made.
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Affiliation(s)
- Athanassios C Tsipis
- Laboratory of Inorganic and General Chemistry, Department of Chemistry, University of Ioannina, 451 10, Ioannina, Greece
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Shi D, Niu X, Sun J, Zhu Z. Potential Energy Curves, Spectroscopic Parameters, and Spin–Orbit Coupling: A Theoretical Study on 24 Λ-S and 54 Ω States of C2+ Cation. J Phys Chem A 2013; 117:2020-34. [DOI: 10.1021/jp312670v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Deheng Shi
- College of
Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Xianghong Niu
- College of
Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Jinfeng Sun
- College of
Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Zunlue Zhu
- College of
Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
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Chu G, Chen J, Liu F, Shan X, Sheng L, Xu Y, Tian S. Positive and negative photoion spectroscopy study of C 2Cl 4. Mol Phys 2013. [DOI: 10.1080/00268976.2012.728256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Poncharal P, Vincent P, Benoit JM, Perisanu S, Ayari A, Choueib M, Purcell ST. Field evaporation tailoring of nanotubes and nanowires. NANOTECHNOLOGY 2010; 21:215303. [PMID: 20431202 DOI: 10.1088/0957-4484/21/21/215303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We explore here the use of field evaporation in a transmission electron microscope for controlled apex modification, opening, and shortening of various types of individual nanotubes and nanowires. The technique works well for conducting carbon nanotubes but also for large bandgap silicon carbide nanowires and insulating boron nitride nanotubes. Since the length reduction does not affect the diameter of the object, we can thus compare mechanical properties at a given diameter for different lengths or, conversely, precisely tune the mechanical resonance frequencies. Opening the nanotubes also creates perspectives for their use as nano-capillaries.
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Affiliation(s)
- P Poncharal
- Laboratoire de Physique de la Matière Condensée et Nanostructures (UMR CNRS 5586), Université Claude Bernard, 69622 Villeurbanne, France
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Tuna T, Chabot M, Pino T, Désesquelles P, LePadellec A, Martinet G, Barat M, Lucas B, Mezdari F, Montagnon L, Van-Oanh NT, Lavergne L, Lachaize A, Carpentier Y, Béroff K. Fragmentation branching ratios of highly excited hydrocarbon molecules CnH and their cations CnH+ (n⩽4). J Chem Phys 2008; 128:124312. [DOI: 10.1063/1.2884862] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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12
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Hochlaf M, Taylor S, Eland JHD. Quartet states of the acetylene cation: electronic structure calculations and spin-orbit coupling terms. J Chem Phys 2006; 125:214301. [PMID: 17166015 DOI: 10.1063/1.2400029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Highly correlated ab initio methods have been used to generate one-dimensional cuts of the six-dimensional potential energy surfaces of the quartet and lowest doublet states for the HCCH(+) ion along the CH, CC, and cis and trans bending coordinates. Transition dipole moments and spin-orbit matrix elements are deduced. For the lowest 1 (4)Sigma(u) (+) state, the calculations predict a possible photon emission through the 1 (4)Pi(g)<--1 (4)Sigma(u) (+) transition competing with internal conversion and predissociation processes. The potential surfaces are used together with spin-orbit matrix elements to discuss the metastability and the predissociation processes forming the C(2)HC(2)H(+)+H(+)H products. Multistep spin-orbit induced predissociation pathways are suggested.
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Affiliation(s)
- M Hochlaf
- Theoretical Chemistry Group, University of Marne-La-Vallée, Champs Sur Marne, F-77454, Marne-La-Vallée, Cedex 2, France.
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13
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A mass spectroscopic study of laser vaporized graphite in H2 and D2 gases: the stability of C2nH2 (n=2–5) and C10. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.01.065] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Structure, Dissociation Energies, and Harmonic Frequencies of Small Doubly Charged Carbon Clusters Cn2+ (n = 3−9). J Phys Chem A 2002. [DOI: 10.1021/jp0257956] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Bousquet RR, Steimle TC. The permanent electric dipole moment of yttrium dicarbide, YC2. J Chem Phys 2001. [DOI: 10.1063/1.1314352] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Lu W, Tosi P, Filippi M, Bassi D. Reactions of C+(2Pu) with CO(1Σ+) from thermal energies to 30 eV. J Chem Phys 2000. [DOI: 10.1063/1.480686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Lu W, Tosi P, Bassi D. Guided ion beam investigation of the reaction CO++CO: C–O bond activation and C–C bond formation. J Chem Phys 1999. [DOI: 10.1063/1.480231] [Citation(s) in RCA: 16] [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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18
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Reid C. Cationic and anionic states of CF, CCl, SiF and SiCl. Some new information derived using translational energy spectroscopy. Chem Phys 1996. [DOI: 10.1016/0301-0104(96)00063-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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