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García-Alfonso E, Barranco M, Bonhommeau DA, Halberstadt N, Pi M, Calvo F. Clustering, collision, and relaxation dynamics in pure and doped helium nanoclusters: Density- vs particle-based approaches. J Chem Phys 2022; 157:014106. [DOI: 10.1063/5.0091942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The clustering, collision, and relaxation dynamics of pristine and doped helium nanodroplets is theoretically investigated in cases of pickup and clustering of heliophilic argon, collision of heliophobic cesium atoms, and coalescence of two droplets brought into contact by their mutual long-range van der Waals interaction. Three approaches are used and compared with each other. The He time-dependent density functional theory method considers the droplet as a continuous medium and accounts for its superfluid character. The ring-polymer molecular dynamics method uses a path-integral description of nuclear motion and incorporates zero-point delocalization while bosonic exchange effects are ignored. Finally, the zero-point averaged dynamics approach is a mixed quantum–classical method in which quantum delocalization is described by attaching a frozen wavefunction to each He atom, equivalent to classical dynamics with effective interaction potentials. All three methods predict that the growth of argon clusters is significantly hindered by the helium host droplet due to the impeding shell structure around the dopants and kinematic effects freezing the growing cluster in metastable configurations. The effects of superfluidity are qualitatively manifested by different collision dynamics of the heliophilic atom at high velocities, as well as quadrupole oscillations that are not seen with particle-based methods, for droplets experiencing a collision with cesium atoms or merging with each other.
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Affiliation(s)
- Ernesto García-Alfonso
- Laboratoire Collisions, Agrégats, Réactivité (LCAR), Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Manuel Barranco
- Laboratoire Collisions, Agrégats, Réactivité (LCAR), Université de Toulouse, CNRS, 31062 Toulouse, France
- Department FQA, Facultat de Física, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
| | - David A. Bonhommeau
- Université de Reims Champagne Ardenne, CNRS, GSMA UMR 7331, 51100 Reims, France
| | - Nadine Halberstadt
- Laboratoire Collisions, Agrégats, Réactivité (LCAR), Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Martí Pi
- Department FQA, Facultat de Física, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
| | - Florent Calvo
- Université Grenoble Alpes, CNRS, LIPHY, F38000 Grenoble, France
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Parneix P, Maupin R, Attal L, Calvo F, Falvo C. Extracting vibrational anharmonicities from short driven molecular dynamics trajectories. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02740-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Désesquelles P, Van-Oanh NT, Thomas S, Domin D. Statistical molecular fragmentation: which parameters influence the branching ratios? Phys Chem Chem Phys 2020; 22:3160-3172. [DOI: 10.1039/c9cp05095g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Our recently developed statistical model for molecular fragmentation (SMF) is used to study the decomposition of propane and to predict thermodynamically controlled yields of products as a function of excitation energy deposited into propane.
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Affiliation(s)
- Pierre Désesquelles
- Laboratoire de Physique des Gaz et des Plasmas
- Univ. Paris-Sud
- CNRS
- Université Paris-Saclay
- Orsay
| | - Nguyen-Thi Van-Oanh
- Laboratoire de Chimie Physique
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- Orsay
| | - Sébastien Thomas
- Laboratoire de Physique des Gaz et des Plasmas
- Univ. Paris-Sud
- CNRS
- Université Paris-Saclay
- Orsay
| | - Dominik Domin
- Faculty of Biotechnology
- Chemistry and Environmental Engineering
- PHENIKAA University
- Vietnam
- PHENIKAA Institute for Advanced Study (PIAS)
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Chakraborty S, Mulas G, Demyk K, Joblin C. Experimental Approach to the Study of Anharmonicity in the Infrared Spectrum of Pyrene from 14 to 723 K. J Phys Chem A 2019; 123:4139-4148. [PMID: 31002512 PMCID: PMC6557715 DOI: 10.1021/acs.jpca.8b11016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Quantifying the effect of anharmonicity on the infrared spectrum of large molecules such as polycyclic aromatic hydrocarbons (PAHs) at high temperatures is the focus of a number of theoretical and experimental studies, many of them motivated by astrophysical applications. We recorded the IR spectrum of pyrene C16H10 microcrystals embedded in KBr pellets over a wide range of temperatures (14-723 K) and studied the evolution of band positions, widths, and integrated intensities with temperature. We identified jumps for some of the spectral characteristics of some bands in the 423-473 K range. These were attributed to a change of phase from crystal to molten in condensed pyrene, which appears to affect more strongly bands involving large CH motions. Empirical anharmonicity factors that quantify the linear evolution of band positions and widths with temperature for values larger than ∼150-250 K, depending on the band, were retrieved from both phases and averaged to provide recommended values for these anharmonicity factors. The derived values were found to be consistent with available gas phase data. We conclude about the relevance of the methodology to produce data that can be compared with calculated anharmonic IR spectra and provide input for models that simulate the IR emission of astro-PAHs.
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Affiliation(s)
- Shubhadip Chakraborty
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
| | - Giacomo Mulas
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
- Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Cagliari, 09047 Selargius (CA), Italy
| | - Karine Demyk
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
| | - Christine Joblin
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
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Calvo F, Parneix P, Falvo C. Atomistic modeling of the infrared response of fullerenes under hydrostatic pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:474001. [PMID: 30265247 DOI: 10.1088/1361-648x/aae50c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The anharmonic infrared spectrum of individual C60 and C70 fullerenes under hydrostatic pressure was theoretically computed by means of atomistic simulations. Using a tight-binding model for the fullerenes and a simple particle-based pressure-transmitting fluid, the structural and vibrational properties were determined at room temperature and up to 20 GPa. All properties generally exhibit relative variations that are linear with increasing pressure, but whose magnitude can be comparable to pure thermal effects. The bond length contraction usually agrees with existing results, and for C70 our approach manages to reproduce the occasionally negative pressure coefficient found for some low-frequency modes in experiments.
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Affiliation(s)
- F Calvo
- University of Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
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Calvo F, Yurtsever E, Birer Ö. Possible Formation of Metastable PAH Dimers upon Pickup by Helium Droplets. J Phys Chem A 2016; 120:1727-36. [DOI: 10.1021/acs.jpca.5b12394] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Calvo
- Univ. Grenoble Alpes, LIPHY, F-38000 Grenoble, France
- CNRS, LIPHY, F-38000 Grenoble, France
| | - E. Yurtsever
- Koç University, Chemistry Department, Rumeli
Feneri Yolu, Sariyer 34450, Istanbul, Turkey
| | - Ö. Birer
- Koç University, Chemistry Department, Rumeli
Feneri Yolu, Sariyer 34450, Istanbul, Turkey
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Sinitskiy AV, Voth GA. A reductionist perspective on quantum statistical mechanics: Coarse-graining of path integrals. J Chem Phys 2015; 143:094104. [DOI: 10.1063/1.4929790] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anton V. Sinitskiy
- Department of Chemistry, James Franck Institute, Institute for Biophysical Dynamics, and Computation Institute, The University of Chicago, 5735 S. Ellis Ave., Chicago, Illinois 60637, USA
| | - Gregory A. Voth
- Department of Chemistry, James Franck Institute, Institute for Biophysical Dynamics, and Computation Institute, The University of Chicago, 5735 S. Ellis Ave., Chicago, Illinois 60637, USA
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Wolf S, Curotto E. Ring polymer dynamics for rigid tops with an improved integrator. J Chem Phys 2014; 141:024116. [DOI: 10.1063/1.4887460] [Citation(s) in RCA: 6] [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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Calvo F, Falvo C, Parneix P. Atomistic Modeling of Vibrational Action Spectra in Polyatomic Molecules: Nuclear Quantum Effects. J Phys Chem A 2014; 118:5427-36. [DOI: 10.1021/jp5040147] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Calvo
- ILM, Université Lyon I and CNRS UMR 5306, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
| | - C. Falvo
- Institut des Sciences
Moléculaires d’Orsay, UMR CNRS 8214, Université Paris Sud 11, Bât.
210, F91405 Orsay Cedex, France
| | - P. Parneix
- Institut des Sciences
Moléculaires d’Orsay, UMR CNRS 8214, Université Paris Sud 11, Bât.
210, F91405 Orsay Cedex, France
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Simon A, Spiegelman F. Conformational dynamics and finite-temperature infrared spectra of the water octamer adsorbed on coronene. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.06.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Simon A, Spiegelman F. Water clusters adsorbed on polycyclic aromatic hydrocarbons: Energetics and conformational dynamics. J Chem Phys 2013; 138:194309. [DOI: 10.1063/1.4805015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Calvo F, Falvo C, Parneix P. A simple but accurate potential for the naphthalene-argon complex: Applications to collisional energy transfer and matrix isolated IR spectroscopy. J Chem Phys 2013; 138:034305. [DOI: 10.1063/1.4773469] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Van-Oanh NT, Falvo C, Calvo F, Lauvergnat D, Basire M, Gaigeot MP, Parneix P. Improving anharmonic infrared spectra using semiclassically prepared molecular dynamics simulations. Phys Chem Chem Phys 2012; 14:2381-90. [DOI: 10.1039/c2cp23101h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Calvo F, Van-Oanh NT, Parneix P, Falvo C. Vibrational spectra of polyatomic molecules assisted by quantum thermal baths. Phys Chem Chem Phys 2012; 14:10503-6. [DOI: 10.1039/c2cp41663h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Simon A, Rapacioli M, Lanza M, Joalland B, Spiegelman F. Molecular dynamics simulations on [FePAH]+ π-complexes of astrophysical interest: anharmonic infrared spectroscopy. Phys Chem Chem Phys 2011; 13:3359-74. [PMID: 21243160 DOI: 10.1039/c0cp00990c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this article, classical Born-Oppenheimer molecular dynamics (MD) simulations in the microcanonical ensemble are performed on neutral and cationic polycyclic aromatic hydrocarbon (PAH) species, focusing on [FePAH](+)π-complexes. Their anharmonic mid-infrared (mid-IR) spectra in the classical approximation are derived. This approach allows us to describe the influence of the energy of a system on its IR spectrum in terms of band-shifts and broadenings. The MD simulations are performed on a potential energy surface (PES) described at the self-consistent-charge density functional tight-binding level of theory. The PES is benchmarked on DFT calculations, showing the validity of the approach for complexes of Fe(+) with PAHs larger than coronene (C(24)H(12)) that are of astrophysical interest. MD simulations at high temperature show the occurrence of the diffusion of the Fe cation on the surface of the PAH. It proceeds through the edge of the carbon skeleton which is the lowest energy pathway presenting barriers smaller than 1 eV. Although only qualitative information on the band broadenings can be obtained, we show that the dependence of the computed positions of the main bands of [C(24)H(12)](0/+)and [FeC(24)H(12)](+)π-complexes on temperature can be fit by linear laws. The spectral trends determined for [FeC(24)H(12)](+) are compared to those of N-substituted [C(23)NH(12)](+)and [SiC(24)H(12)](+)π-complexes of astrophysical interest.
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Affiliation(s)
- Aude Simon
- Laboratoire de Chimie et Physique Quantiques, IRSAMC, Université de Toulouse, UPS, LCPQ, 118 Route de Narbonne, F-31062 Toulouse, France.
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Amadei A, Daidone I, Zanetti-Polzi L, Aschi M. Modeling quantum vibrational excitations in condensed-phase molecular systems. Theor Chem Acc 2011. [DOI: 10.1007/s00214-010-0882-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Calvo F, Parneix P, Van-Oanh NT. Finite-temperature infrared spectroscopy of polycyclic aromatic hydrocarbon molecules. II. Principal mode analysis and self-consistent phonons. J Chem Phys 2010; 133:074303. [DOI: 10.1063/1.3465554] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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