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Khatymov RV, Muftakhov MV, Tuktarov RF, Shchukin PV, Khatymova LZ, Pancras E, Terentyev AG, Petrov NI. Resonant electron capture by polycyclic aromatic hydrocarbon molecules: Effects of aza-substitution. J Chem Phys 2024; 160:124310. [PMID: 38533882 DOI: 10.1063/5.0195316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Accepted: 03/07/2024] [Indexed: 03/28/2024] Open
Abstract
Resonant electron capture by aza and diaza derivatives of phenanthrene (7,8-benzoquinoline and 1,10-phenanthroline) and anthracene (acridine and phenazine) at incident free electron energies (Ee) in the range of 0-15 eV was studied. All compounds except 7,8-benzoquinoline form long-lived molecular ions (M-) at thermal electron energies (Ee ∼ 0 eV). Acridine and phenazine also form such ions at epithermal electron energies up to Ee = 1.5-2.5 eV. The lifetimes (τa) of M- with respect to electron autodetachment are proportional to the extent of aza-substitution and increase on going from molecules with bent geometry of the fused rings (azaphenanthrenes) to linear isomers (azaanthracenes). These regularities are due to an increase in the adiabatic electron affinities (EAa) of the molecules. The EAa values of the molecules under study were comprehensively assessed based on a comparative analysis of the measured τa values using the Rice-Ramsperger-Kassel-Marcus theory, the electronic structure analysis using the molecular orbital approach, as well as the density functional calculations of the total energy differences between the molecules and anions. The only fragmentation channel of M- ions from the compounds studied is abstraction of hydrogen atoms. When studying [M-H]- ions, electron autodetachment processes were observed, the τa values were measured, and the appearance energies were determined. A comparative analysis of the gas-phase acidity of the molecules and the EAa values of the [M-H]· radicals revealed their proportionality to the EAa values of the parent molecules.
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Affiliation(s)
- Rustem V Khatymov
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Renat F Tuktarov
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Pavel V Shchukin
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Lyaysan Z Khatymova
- Institute of Molecule and Crystal Physics, Ufa Federal Research Center, Russian Academy of Sciences, Prospekt Oktyabrya, 151, 450075 Ufa, Russia
| | - Eugene Pancras
- Ufa State Petroleum Technological University, ul. Kosmonavtov, 1, 450064 Ufa, Russia
| | - Andrey G Terentyev
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
| | - Nikolay I Petrov
- Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, 125047 Moscow, Russia
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Prajapati D, Yadav H, Vinodkumar M, Limbachiya C, Vinodkumar PC. Electron impact scattering study on chlorobenzene. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1554191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Dineshkumar Prajapati
- Shree M R Arts & Science College, Rajpipla, India
- Department of Physics, Sardar Patel University, Vallabh Vidyanagar, India
| | - Hitesh Yadav
- Department of Physics, Sardar Patel University, Vallabh Vidyanagar, India
- V. P. & R. P. T. P. Science College, Vallabh Vidyanagar, India
| | | | - Chetan Limbachiya
- Department of Applied Physics, The M. S. University of Baroda, Vadodara, India
| | - P. C. Vinodkumar
- Department of Physics, Sardar Patel University, Vallabh Vidyanagar, India
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Barbosa AS, Bettega MHF. Shape resonances, virtual state, and Ramsauer-Townsend minimum in the low-energy electron collisions with benzene. J Chem Phys 2018; 146:154302. [PMID: 28433013 DOI: 10.1063/1.4981215] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we revisit the low-energy electron scattering by benzene. We employed the Schwinger multichannel method implemented with pseudopotentials to carry out systematic cross section calculations with different schemes of polarization for the resonant and the totally symmetric irreducible representations within the D2h symmetry group. We present integral and differential cross sections for incident electron energies up to 12 eV and discuss the shape resonances and the presence of a Ramsauer-Townsend minimum and a virtual state in the former. We also discuss the relation of these physical phenomena with the different schemes of the polarization effects employed in our calculations. Finally, the comparison of our calculated integral and differential cross sections with the available data from the literature suggests improvement in the agreement between theory and experiment.
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Affiliation(s)
- Alessandra Souza Barbosa
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil
| | - Márcio H F Bettega
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba, Paraná, Brazil
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