1
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Semiempirical Potential in Kinetics Calculations on the HC3N + CN Reaction. Molecules 2022; 27:molecules27072297. [PMID: 35408696 PMCID: PMC9000235 DOI: 10.3390/molecules27072297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/25/2022] [Accepted: 03/28/2022] [Indexed: 02/04/2023] Open
Abstract
The reaction between the cyano radical CN and cyanoacetylene molecule HC3N is of great interest in different astronomical fields, from star-forming regions to planetary atmospheres. In this work, we present a new synergistic theoretical approach for the derivation of the rate coefficient for gas phase neutral-neutral reactions. Statistic RRKM calculations on the Potential Energy Surface are coupled with a semiempirical analysis of the initial bimolecular interaction. The value of the rate coefficient for the HC3N + CN → H + NCCCCN reaction obtained with this method is compared with previous theoretical and experimental investigations, showing strengths and weaknesses of the new presented approach.
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2
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Mancini L, Vanuzzo G, Marchione D, Pannacci G, Liang P, Recio P, Rosi M, Skouteris D, Casavecchia P, Balucani N. The Reaction N( 2D) + CH 3CCH (Methylacetylene): A Combined Crossed Molecular Beams and Theoretical Investigation and Implications for the Atmosphere of Titan. J Phys Chem A 2021; 125:8846-8859. [PMID: 34609869 PMCID: PMC8521525 DOI: 10.1021/acs.jpca.1c06537] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The reaction of excited
nitrogen atoms N(2D) with CH3CCH (methylacetylene)
was investigated under single-collision
conditions by the crossed molecular beams (CMB) scattering method
with mass spectrometric detection and time-of-flight analysis at the
collision energy (Ec) of 31.0 kJ/mol.
Synergistic electronic structure calculations of the doublet potential
energy surface (PES) were performed to assist the interpretation of
the experimental results and characterize the overall reaction micromechanism.
Theoretically, the reaction is found to proceed via a barrierless addition of N(2D) to the carbon–carbon
triple bond of CH3CCH and an insertion of N(2D) into the CH bond of the methyl group, followed
by the formation of cyclic and linear intermediates that can undergo
H, CH3, and C2H elimination or isomerize to
other intermediates before unimolecularly decaying to a variety of
products. Kinetic calculations for addition and insertion mechanisms
and statistical (Rice-Ramsperger-Kassel-Marcus) computations of product
branching fractions (BFs) on the theoretical PES were performed at
different values of total energy, including the one corresponding
to the temperature (175 K) of Titan’s stratosphere and that
of the CMB experiment. Up to 14 competing product channels were statistically
predicted, with the main ones, at Ec =
31.0 kJ/mol, being the formation of CH2NH (methanimine)
+ C2H (ethylidyne) (BF = 0.41), c-C(N)CH
+ CH3 (BF = 0.32), CH2CHCN (acrylonitrile) +
H (BF = 0.12), and c-CH2C(N)CH + H (BF
= 0.04). Of the 14 possible channels, seven correspond to H displacement
channels of different exothermicity, for a total H channel BF of ∼0.25
at Ec = 31.0 kJ/mol. Experimentally, dynamical
information could only be obtained about the overall H channels. In
particular, the experiment corroborates the formation of acrylonitrile
+ H, which is the most exothermic of all 14 reaction channels and
is theoretically calculated to be the dominant H-forming channel (BF
= 0.12). The products containing a novel C–N bond could be
potential precursors to form other nitriles (C2N2, C3N) or more complex organic species containing N atoms
in planetary atmospheres, such as those of Titan and Pluto. Overall,
the results are expected to have a potentially significant impact
on the understanding of the gas-phase chemistry of Titan’s
atmosphere and the modeling of that atmosphere.
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Affiliation(s)
- Luca Mancini
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Gianmarco Vanuzzo
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Demian Marchione
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Giacomo Pannacci
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Pengxiao Liang
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Pedro Recio
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Marzio Rosi
- Dipartimento di Ingegneria Civile e Ambientale, Università degli Studi di Perugia, 06125 Perugia, Italy
| | | | - Piergiorgio Casavecchia
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Nadia Balucani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
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3
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Caglioti C, Palazzetti F. Potential Energy Surfaces for Water Interacting with Heteronuclear Diatomic Molecules: H2O–HF as a Case Study. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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4
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Parsons BF, Jayson CJ, Szpunar DE, Cook MM. Photodissociation of the N 2-NO Complex between 225.8 and 224.0 nm. J Phys Chem A 2021; 125:3406-3414. [PMID: 33852318 DOI: 10.1021/acs.jpca.1c01920] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Our primary goal was to measure the NO (A) photoproduct appearance energy and ground-state dissociation energy of the N2-NO complex. We recorded velocity map ion images of NO photofragments resulting from the dissociation of the N2-NO complex excited between ∼225.8 and 224.0 nm, which ranged from the photodissociation threshold to about 342 cm-1 above the threshold. In the experiment, one photon dissociated the complex through the N2 (X 1Σg+)-NO (A 2Σ+) ← N2 (X 1Σg+)-NO (X 2Π) transition, and a second photon nonresonantly ionized the NO (A) photoproduct. The lowest-energy photons near 225.8 nm did not have sufficient energy to photodissociate the lowest excited state of the complex; however, dissociation was observed with increasing photon energy. On the basis of the experiments, we determined the appearance energy for the NO (A) photoproduct to be 44 284.7 ± 2.8 cm-1. From the appearance energy and the NO A ← X origin band transition, we determined a ground-state dissociation energy of 85.8 ± 2.8 cm-1. As we increased the photon energy, the excess energy was partitioned into rotational modes of the diatomic products as well as product translational energy. We found good agreement between the average fraction of rotational energy and the predictions of a simple pseudo three atom impulsive model. Finally, at all photon energies, we observed some contribution from internally excited complexes in the resulting P(ET). The maximum internal energy of these complexes was consistent with the ground-state dissociation energy.
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Affiliation(s)
- Bradley F Parsons
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - Cameron J Jayson
- Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - David E Szpunar
- Department of Chemistry, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, Wisconsin 54481, United States
| | - Mark M Cook
- Department of Chemistry, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, Wisconsin 54481, United States
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5
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Falcinelli S, Rosi M, Pirani F, Bassi D, Alagia M, Schio L, Richter R, Stranges S, Balucani N, Lorent V, Vecchiocattivi F. Angular Distribution of Ion Products in the Double Photoionization of Propylene Oxide. Front Chem 2019; 7:621. [PMID: 31572712 PMCID: PMC6749015 DOI: 10.3389/fchem.2019.00621] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 08/29/2019] [Indexed: 11/13/2022] Open
Abstract
A photoelectron-photoion-photoion coincidence technique, using an ion imaging detector and tunable synchrotron radiation in the 18.0–37.0 eV photon energy range, inducing the ejection of molecular valence electrons, has been applied to study the double ionization of the propylene oxide, a simple prototype chiral molecule. The experiment performed at the Elettra Synchrotron Facility (Trieste, Italy) allowed to determine angular distributions for ions produced by the two-body dissociation reactions following the Coulomb explosion of the intermediate (C3H6O)2+ molecular dication. The analysis of the coincidence spectra recorded at different photon energies was done in order to determine the dependence of the β anisotropy parameter on the photon energy for the investigated two-body fragmentation channels. In particular, the reaction leading to CH3+ + C2H3O+ appears to be characterized by an increase of β, from β ≈ 0.00 up to β = 0.59, as the photon energy increases from 29.7 to 37.0 eV, respectively. This new observation confirms that the dissociation channel producing CH3+ and C2H3O+ final ions can occur with two different microscopic mechanisms as already indicated by the bimodality obtained in the kinetic energy released (KER) distributions as a function of the photon energy in a recent study. Energetic considerations suggest that experimental data are compatible with the formation of two different stable isomers of C2H3O+: acetyl and oxiranyl cations. These new experimental data are inherently relevant and are mandatory information for further experimental and theoretical investigations involving oriented chiral molecules and linearly or circularly polarized radiation. This work is in progress in our laboratory.
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Affiliation(s)
- Stefano Falcinelli
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
| | - Marzio Rosi
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
| | - Fernando Pirani
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - Davide Bassi
- Department of Physics, University of Trento, Trento, Italy
| | | | - Luca Schio
- IOM-CNR Tasc, Trieste, Italy.,Department of Basic and Applied Sciences for Engineering (SBAI), University of Rome "Sapienza", Rome, Italy
| | | | - Stefano Stranges
- IOM-CNR Tasc, Trieste, Italy.,Department of Chemistry and Drug Technologies, University of Rome "Sapienza", Rome, Italy
| | - Nadia Balucani
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - Vincent Lorent
- Laboratoire de physique des lasers, Université Paris 13 (UP13) - Institut Galilée - CNRS LPL UMR7538, Villetaneuse, France
| | - Franco Vecchiocattivi
- Department of Civil and Environmental Engineering, University of Perugia, Perugia, Italy
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6
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Kurnosov A, Cacciatore M, Pirani F, Laganà A, Martí C, Garcia E. Closer versus Long Range Interaction Effects on the Non-Arrhenius Behavior of Quasi-Resonant O 2 + N 2 Collisions. J Phys Chem A 2017; 121:5088-5099. [PMID: 28598167 DOI: 10.1021/acs.jpca.7b04204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report in this paper an investigation on energy transfer processes from vibration to vibration and/or translation in thermal and subthermal regimes for the O2 + N2 system performed using quantum-classical calculations on different empirical, semiempirical, and ab initio potential energy surfaces. In particular, the paper focuses on the rationalization of the non-Arrhenius behavior (inversion of the temperature dependence) of the quasi-resonant vibration-to-vibration energy transfer transition rate coefficients at threshold. To better understand the microscopic nature of the involved processes, we pushed the calculations to the detail of the related cross sections and analyzed the impact of the medium and long-range components of the interaction on them. Furthermore, the variation with temperature of the dependence of the quasi-resonant rate coefficient on the vibrational energy gap between initial and final vibrational states and the effectiveness of quantum-classical calculations to overcome the limitations of the purely classical treatments were also investigated. These treatments, handled in an open molecular science fashion by chaining data and competencies of the various laboratories using a grid empowered molecular simulator, have allowed a rationalization of the dependence of the computed rate coefficients in terms of the distortion of the O2-N2 configuration during the diatom-diatom collisions. A way of relating such distortions to a smooth and continuous progress variable, allowing a proper evolution from both long to closer range formulation of the interaction and from its entrance to exit channel (through the strong interaction region) relaxed graphical representations, is also discussed in the paper.
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Affiliation(s)
- A Kurnosov
- Troitsk Institute of Innovation and Fusion Research , 142092 Troitsk, Moscow, Russia
| | - M Cacciatore
- Nanotec-Institute for Nanotechnology, CNR , Via Amendola 122/D, 70126 Bari, Italy
| | - F Pirani
- Nanotec-Institute for Nanotechnology, CNR , Via Amendola 122/D, 70126 Bari, Italy.,Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - A Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - C Martí
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - E Garcia
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU) , 01006 Vitoria, Spain
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7
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Garcia E, Laganà A, Pirani F, Bartolomei M, Cacciatore M, Kurnosov A. Enhanced Flexibility of the O2 + N2 Interaction and Its Effect on Collisional Vibrational Energy Exchange. J Phys Chem A 2016; 120:5208-19. [PMID: 26982814 DOI: 10.1021/acs.jpca.6b00962] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Prompted by a comparison of measured and computed rate coefficients of Vibration-to-Vibration and Vibration-to-Translation energy transfer in O2 + N2 non-reactive collisions, extended semiclassical calculations of the related cross sections were performed to rationalize the role played by attractive and repulsive components of the interaction on two different potential energy surfaces. By exploiting the distributed concurrent scheme of the Grid Empowered Molecular Simulator we extended the computational work to quasiclassical techniques, investigated in this way more in detail the underlying microscopic mechanisms, singled out the interaction components facilitating the energy transfer, improved the formulation of the potential, and performed additional calculations that confirmed the effectiveness of the improvement introduced.
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Affiliation(s)
- E Garcia
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU) , 01006 Vitoria, Spain
| | - A Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - F Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - M Bartolomei
- Instituto de Física Fundamental, CSIC , Serrano 123, 28006 Madrid, Spain
| | - M Cacciatore
- Nanotec-Institute for Nanotechnology, CNR , c/o University campus, Chemistry Department, Via Orabona 4, 70123 Bari, Italy
| | - A Kurnosov
- Troitsk Institute of Innovation and Fusion Research , 142092 Troitsk, Moscow, Russia
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8
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Lombardi A, Pirani F, Laganà A, Bartolomei M. Energy transfer dynamics and kinetics of elementary processes (promoted) by gas-phase CO2 -N2 collisions: Selectivity control by the anisotropy of the interaction. J Comput Chem 2016; 37:1463-75. [PMID: 27031183 DOI: 10.1002/jcc.24359] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/01/2016] [Accepted: 02/22/2016] [Indexed: 11/10/2022]
Abstract
In this work, we exploit a new formulation of the potential energy and of the related computational procedures, which embodies the coupling between the intra and intermolecular components, to characterize possible propensities of the collision dynamics in energy transfer processes of interest for simulation and control of phenomena occurring in a variety of equilibrium and nonequilibrium environments. The investigation reported in the paper focuses on the prototype CO2 -N2 system, whose intramolecular component of the interaction is modeled in terms of a many body expansion while the intermolecular component is modeled in terms of a recently developed bonds-as-interacting-molecular-centers' approach. The main advantage of this formulation of the potential energy surface is that of being (a) truly full dimensional (i.e., all the variations of the coordinates associated with the molecular vibrations and rotations on the geometrical and electronic structure of the monomers, are explicitly taken into account without freezing any bonds or angles), (b) more flexible than other usual formulations of the interaction and (c) well suited for fitting procedures better adhering to accurate ab initio data and sensitive to experimental arrangement dependent information. Specific attention has been given to the fact that a variation of vibrational and rotational energy has a higher (both qualitative and quantitative) impact on the energy transfer when a more accurate formulation of the intermolecular interaction (with respect to that obtained when using rigid monomers) is adopted. This makes the potential energy surface better suited for the kinetic modeling of gaseous mixtures in plasma, combustion and atmospheric chemistry computational applications. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Andrea Lombardi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce di Sotto 8, Perugia, 06123, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce di Sotto 8, Perugia, 06123, Italy
| | - Antonio Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce di Sotto 8, Perugia, 06123, Italy
| | - Massimiliano Bartolomei
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, Madrid, 28006, Spain
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9
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Garcia E, Kurnosov A, Laganà A, Pirani F, Bartolomei M, Cacciatore M. Efficiency of Collisional O2 + N2 Vibrational Energy Exchange. J Phys Chem B 2016; 120:1476-85. [PMID: 26292835 DOI: 10.1021/acs.jpcb.5b06423] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
By following the scheme of the Grid Empowered Molecular Simulator (GEMS), a new O2 + N2 intermolecular potential, built on ab initio calculations and experimental (scattering and second virial coefficient) data, has been coupled with an appropriate intramolecular one. On the resulting potential energy surface detailed rate coefficients for collision induced vibrational energy exchanges have been computed using a semiclassical method. A cross comparison of the computed rate coefficients with the outcomes of previous semiclassical calculations and kinetic experiments has provided a foundation for characterizing the main features of the vibrational energy transfer processes of the title system as well as a critical reading of the trajectory outcomes and kinetic data. On the implemented procedures massive trajectory runs for the proper interval of initial conditions have singled out structures of the vibrational distributions useful to formulate scaling relationships for complex molecular simulations.
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Affiliation(s)
- E Garcia
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU) , 01006 Vitoria, Spain
| | - A Kurnosov
- Troitsk Institute of Innovation and Fusion Research , 142092 Troitsk, Moscow, Russia
| | - A Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - F Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - M Bartolomei
- Instituto de Física Fundamental, IFF-CSIC , Serrano 123, 28006 Madrid, Spain
| | - M Cacciatore
- Nanotec - Institute for Nanotechnology CNR c/o University campus , Chemistry Department, Via Orabona 4, 70123 Bari, Italy
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10
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Ohoyama H. Collision Energy Dependent Cross Section and Rotational Alignment of NO (A 2Σ+) in the Energy-Transfer Reaction of N2 (A3Σu+) + NO (X 2Π) → N2 (X 1Σg+) + NO (A 2Σ+). J Phys Chem A 2014; 118:9646-52. [DOI: 10.1021/jp507696y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H. Ohoyama
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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11
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Bartolomei M, Carmona-Novillo E, Hernández MI, Campos-Martínez J, Moszyński R. Global ab Initio Potential Energy Surface for the O2(3Σg –) + N2(1Σg +) Interaction. Applications to the Collisional, Spectroscopic, and Thermodynamic Properties of the Complex. J Phys Chem A 2014; 118:6584-94. [DOI: 10.1021/jp503182h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Massimiliano Bartolomei
- Instituto de Física Fundamental, (IFF-CSIC) Consejo Superior de Investigaciones Científicas , Serrano 123, 28006 Madrid, Spain
| | - Estela Carmona-Novillo
- Instituto de Física Fundamental, (IFF-CSIC) Consejo Superior de Investigaciones Científicas , Serrano 123, 28006 Madrid, Spain
| | - Marta I. Hernández
- Instituto de Física Fundamental, (IFF-CSIC) Consejo Superior de Investigaciones Científicas , Serrano 123, 28006 Madrid, Spain
| | - José Campos-Martínez
- Instituto de Física Fundamental, (IFF-CSIC) Consejo Superior de Investigaciones Científicas , Serrano 123, 28006 Madrid, Spain
| | - Robert Moszyński
- Quantum Chemistry Laboratory, Faculty of Chemistry, University of Warsaw , L. Pasteura 1, 02-093 Warszawa, Poland
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12
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13
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Bartolomei M, Pirani F, Laganà A, Lombardi A. A full dimensional grid empowered simulation of the CO2 + CO2 processes. J Comput Chem 2012; 33:1806-19. [PMID: 22618572 DOI: 10.1002/jcc.23010] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 03/26/2012] [Accepted: 04/15/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Massimiliano Bartolomei
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas Serrano 123, 28006 Madrid, Spain
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14
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de Petris G, Troiani A, Rosi M, Sgamellotti A, Cipollini R. The azido oxide N3O. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.06.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Bartolomei M, Carmona-Novillo E, Hernández MI, Campos-Martínez J, Hernández-Lamoneda R. Global ab initio potential energy surfaces for the O2(Σ3g−)+O2(Σ3g−) interaction. J Chem Phys 2010; 133:124311. [DOI: 10.1063/1.3479395] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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16
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Cappelletti D, Candori P, Roncaratti L, Pirani F. A molecular beam scattering study of the weakly bound complexes of water and hydrogen sulphide with the main components of air. Mol Phys 2010. [DOI: 10.1080/00268976.2010.495733] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Wen B, Meyer H, Kłos J. The structure of the NO(X (2)Pi)-N(2) complex: A joint experimental-theoretical study. J Chem Phys 2010; 132:154305. [PMID: 20423179 DOI: 10.1063/1.3380666] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the first measurement of the spectrum of the NO-N(2) complex in the region of the first vibrational NO overtone transition. The origin band of the complex is blueshifted by 0.30 cm(-1) from the corresponding NO monomer frequency. The observed spectrum consists of three bands assigned to the origin band, the excitation of one quantum of z-axis rotation and one associated hot band. The spacing of the bands and the rotational structure indicate a T-shaped vibrationally averaged structure with the NO molecule forming the top of the T. These findings are confirmed by high level ab initio calculations of the potential energy surfaces in planar symmetry. The deepest minimum is found for a T-shaped geometry on the A(")-surface. As a result the sum potential also has the global minimum for this structure. The different potential surfaces show several additional local minima at slightly higher energies indicating that the complex most likely will perform large amplitude motion even in its ground vibrational state. Nevertheless, as suggested by the measured spectra, the complex must, on average, spend a substantial amount of time near the T-shaped configuration.
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Affiliation(s)
- B Wen
- Department of Physics and Astronomy, The University of Georgia, Athens, Georgia 30602-2451, USA
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18
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Thibault F, Cappelletti D, Pirani F, Bartolomei M. A Bond−Bond Description of the Intermolecular Interaction Energy: The Case of the Weakly Bound Acetylene−Hydrogen Complex. J Phys Chem A 2009; 113:14867-74. [DOI: 10.1021/jp905055n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Thibault
- Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes I, F-35042 Rennes, France, Dipartimento di Ingegneria Civile ed Ambientale Universita di Perugia, 06100 Perugia, Italy, Dipartimento di Chimica, Universita di Perugia, 06100 Perugia, Italy, and Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
| | - D. Cappelletti
- Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes I, F-35042 Rennes, France, Dipartimento di Ingegneria Civile ed Ambientale Universita di Perugia, 06100 Perugia, Italy, Dipartimento di Chimica, Universita di Perugia, 06100 Perugia, Italy, and Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
| | - F. Pirani
- Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes I, F-35042 Rennes, France, Dipartimento di Ingegneria Civile ed Ambientale Universita di Perugia, 06100 Perugia, Italy, Dipartimento di Chimica, Universita di Perugia, 06100 Perugia, Italy, and Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
| | - M. Bartolomei
- Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes I, F-35042 Rennes, France, Dipartimento di Ingegneria Civile ed Ambientale Universita di Perugia, 06100 Perugia, Italy, Dipartimento di Chimica, Universita di Perugia, 06100 Perugia, Italy, and Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain
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Karimi-Jafari MH, Ashouri M, Yeganeh-Jabri A. Coping with the anisotropy in the analytical representation of an ab initio potential energy surface for the Cl2 dimer. Phys Chem Chem Phys 2009; 11:5561-8. [PMID: 19842472 DOI: 10.1039/b900847k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intermolecular potential energy surface (PES) of the Cl2 dimer is calculated at the MP2/aTZ + b level of ab initio theory. A quantitative measure is proposed for comparison of the anisotropy of PESs of different systems at different intermolecular distances. A high degree of anisotropy at short and intermediate distances results in the failure of fitting strategies that are based on the angular expansion of the potential energy. To tackle this problem, a step-by-step fitting strategy is designed for analytical representation of the PES. The global minimum energy configuration of the dimer is found to be a distorted L-shape structure with a well depth of around 615 cm(-1). The PES is finally scaled to minimize deviations between calculated and experimental second virial coefficients.
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Affiliation(s)
- M H Karimi-Jafari
- Computational Chemistry Laboratory, Nuclear Science and Technology Research Institute, Tehran, Iran.
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