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Szabó P, Gustafsson M. Polyatomic radiative association by quasiclassical trajectory calculations: Formation of HCN and HNC molecules in H + CN collisions. J Chem Phys 2023; 159:144112. [PMID: 37831719 DOI: 10.1063/5.0170577] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 08/21/2023] [Indexed: 10/15/2023] Open
Abstract
We have developed the polyatomic extension of the established [M. Gustafsson, J. Chem. Phys. 138, 074308 (2013)] classical theory of radiative association in the absence of electronic transitions. The cross section and the emission spectrum of the process is calculated by a quasiclassical trajectory method combined with the classical Larmor formula which can provide the radiated power in collisions. We have also proposed a Monte Carlo scheme for efficient computation of ro-vibrationally quantum state resolved cross sections for radiative association. Besides the method development, the global potential energy and dipole surfaces for H + CN collisions have been calculated and fitted to test our polyatomic semiclassical method.
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Affiliation(s)
- Péter Szabó
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
- Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Avenue Circulaire 3, 1180 Brussels, Belgium
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Magnus Gustafsson
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
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2
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Ibrayev NK, Seliverstova EV, Valiev RR, Kanapina AE, Ishchenko AA, Kulinich AV, Kurten T, Sundholm D. Influence of plasmons on the luminescence properties of solvatochromic merocyanine dyes with different solvatochromism. Phys Chem Chem Phys 2023; 25:22851-22861. [PMID: 37584652 DOI: 10.1039/d3cp03029f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
The effect of localized surface plasmon resonance (LSPR) of a system consisting of a highly dipolar merocyanine dye and a silver nanoparticle (NP) was studied experimentally and theoretically. A theoretical model for estimating the fluorescence quantum yield (φfl) using quantum chemical calculations of intramolecular and intermolecular electronic transition rate constants was developed. Calculations show that the main deactivation channels of the lowest excited singlet state of the studied merocyanines are internal conversion (kIC(S1 → S0)) and fluorescence (kr(S1 → S0)). The intersystem-crossing transition has a low probability due to the large energy difference between the singlet and triplet levels. In the presence of plasmonic NPs, the fluorescence quantum yield is increased by a factor of two according to both experiment and computations. The calculated values of φfl, when considering changes in kr(S1 → S0) and the energy-transfer rate constant (ktransfer) from the dye to the NP was also twice as large at distances of 6-8 nm between the NP and the dye molecule. We also found that the LSPR effect can be increased or decreased depending on the value of the dielectric constant (εm) of the environment.
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Affiliation(s)
- Niyazbek Kh Ibrayev
- Institute of Molecular Nanophotonics, Buketov Karaganda University, 100024 Karaganda, Kazakhstan
| | - Evgeniya V Seliverstova
- Institute of Molecular Nanophotonics, Buketov Karaganda University, 100024 Karaganda, Kazakhstan
| | - Rashid R Valiev
- Department of Chemistry, University of Helsinki, FI-00014 Helsinki, Finland.
- Institute of Molecular Nanophotonics, Buketov Karaganda University, 100024 Karaganda, Kazakhstan
| | - Assel E Kanapina
- Institute of Molecular Nanophotonics, Buketov Karaganda University, 100024 Karaganda, Kazakhstan
| | | | | | - Theo Kurten
- Department of Chemistry, University of Helsinki, FI-00014 Helsinki, Finland.
| | - Dage Sundholm
- Department of Chemistry, University of Helsinki, FI-00014 Helsinki, Finland.
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3
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Schröder B. Ab Initio Rovibrational Spectroscopy of the Acetylide Anion. Molecules 2023; 28:5700. [PMID: 37570670 PMCID: PMC10420331 DOI: 10.3390/molecules28155700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/22/2023] [Accepted: 07/22/2023] [Indexed: 08/13/2023] Open
Abstract
In this work the rovibrational spectrum of the acetylide anion HCC- is investigated using high-level electronic structure methods and variational rovibrational calculations. Using a composite approach the potential energy surface and dipole surface is constructed from explicitly correlated coupled-cluster accounting for corrections due to core-valence correlation, scalar relativistic effects and higher-order excitation effects. Previous approaches for approximating the latter are critically evaluated. Employing the composite potential, accurate spectroscopic parameters determined from variational calculations are presented. In comparison to the few available reference data the present results show excellent agreement with ground state rotational constants within 0.005% of the experimental value. Intensities determined from the variational calculations suggest the bending fundamental transition ν2 around 510 cm-1 to be the best target for detection. The rather weak CD stretching fundamental ν1 in deuterated isotopologues show a second-order resonance with the (0,20,1) state and the consequences are discussed in some detail. The spectroscopic parameters and band intensities provided for a number of vibrational bands in isotopologues of the acetylide anion should facilitate future spectroscopic investigations.
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Affiliation(s)
- Benjamin Schröder
- Institute of Physical Chemistry, University of Goettingen, Tammannstr. 6, 37077 Göttingen, Germany
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Priyadarshini MS, Jo SM, Venturi S, Schwenke DW, Jaffe RL, Panesi M. Comprehensive Study of HCN: Potential Energy Surfaces, State-to-State Kinetics, and Master Equation Analysis. J Phys Chem A 2022; 126:8249-8265. [DOI: 10.1021/acs.jpca.2c03959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maitreyee Sharma Priyadarshini
- Center for Hypersonics & Entry Systems Studies, Department of Aerospace Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
| | - Sung Min Jo
- Center for Hypersonics & Entry Systems Studies, Department of Aerospace Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
| | - Simone Venturi
- Center for Hypersonics & Entry Systems Studies, Department of Aerospace Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
| | - David W. Schwenke
- NASA Ames Research Center, Moffett Field, California94035, United States
| | - Richard L. Jaffe
- NASA Ames Research Center, Moffett Field, California94035, United States
| | - Marco Panesi
- Center for Hypersonics & Entry Systems Studies, Department of Aerospace Engineering, University of Illinois, Urbana-Champaign, Urbana, Illinois61801, United States
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Collisional excitation of HNC by He found to be stronger than for structural isomer HCN in experiments at the low temperatures of interstellar space. Nat Chem 2022; 14:811-815. [PMID: 35513509 DOI: 10.1038/s41557-022-00936-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 03/25/2022] [Indexed: 11/08/2022]
Abstract
HCN and its unstable isomer HNC are widely observed throughout the interstellar medium, with the HNC/HCN abundance ratio correlating strongly with temperature. In very cold environments HNC can even appear more abundant than HCN. Here we use a chirped pulse Fourier transform spectrometer to measure the pressure broadening of HCN and HNC, simultaneously formed in situ by laser photolysis and cooled to low temperatures in uniform supersonic flows of helium. Despite the apparent similarity of these systems, we find the HNC-He cross section to be more than twice as big as the HCN-He cross section at 10 K, confirming earlier quantum calculations. Our experimental results are supported by high-level scattering calculations and are also expected to apply with para-H2, demonstrating that HCN and HNC have different collisional excitation properties that strongly influence the derived interstellar abundances.
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Szczepaniak M, Moc J. Elusive Cyanoform: Computational Probing Its Stability and Reactivity with Accurate Ab Initio Methods. J Phys Chem A 2020; 124:2634-2648. [DOI: 10.1021/acs.jpca.0c00540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marek Szczepaniak
- Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
| | - Jerzy Moc
- Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
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Khalouf-Rivera J, Carvajal M, Santos LF, Pérez-Bernal F. Calculation of Transition State Energies in the HCN–HNC Isomerization with an Algebraic Model. J Phys Chem A 2019; 123:9544-9551. [DOI: 10.1021/acs.jpca.9b07338] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jamil Khalouf-Rivera
- Depto. de Ciencias Integradas y Centro de Estudios Avanzados en Física, Matemáticas y Computación, Universidad de Huelva, Huelva 21071, Spain
| | - Miguel Carvajal
- Depto. de Ciencias Integradas y Centro de Estudios Avanzados en Física, Matemáticas y Computación, Universidad de Huelva, Huelva 21071, Spain
- Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Granada 18071, Spain
| | - Lea F. Santos
- Department of Physics, Yeshiva University, New York, New York 10016, United States
| | - Francisco Pérez-Bernal
- Depto. de Ciencias Integradas y Centro de Estudios Avanzados en Física, Matemáticas y Computación, Universidad de Huelva, Huelva 21071, Spain
- Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Granada 18071, Spain
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