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Lozano AI, Álvarez L, García-Abenza A, Guerra C, Kossoski F, Rosado J, Blanco F, Oller JC, Hasan M, Centurion M, Weber T, Slaughter DS, Mootheril DM, Dorn A, Kumar S, Limão-Vieira P, Colmenares R, García G. Electron Scattering from 1-Methyl-5-Nitroimidazole: Cross-Sections for Modeling Electron Transport through Potential Radiosensitizers. Int J Mol Sci 2023; 24:12182. [PMID: 37569557 PMCID: PMC10418670 DOI: 10.3390/ijms241512182] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
In this study, we present a complete set of electron scattering cross-sections from 1-Methyl-5-Nitroimidazole (1M5NI) molecules for impact energies ranging from 0.1 to 1000 eV. This information is relevant to evaluate the potential role of 1M5NI as a molecular radiosensitizers. The total electron scattering cross-sections (TCS) that we previously measured with a magnetically confined electron transmission apparatus were considered as the reference values for the present analysis. Elastic scattering cross-sections were calculated by means of two different schemes: The Schwinger multichannel (SMC) method for the lower energies (below 15 eV) and the independent atom model-based screening-corrected additivity rule with interferences (IAM-SCARI) for higher energies (above 15 eV). The latter was also applied to calculate the total ionization cross-sections, which were complemented with experimental values of the induced cationic fragmentation by electron impact. Double differential ionization cross-sections were measured with a reaction microscope multi-particle coincidence spectrometer. Using a momentum imaging spectrometer, direct measurements of the anion fragment yields and kinetic energies by the dissociative electron attachment are also presented. Cross-sections for the other inelastic channels were derived with a self-consistent procedure by sampling their values at a given energy to ensure that the sum of the cross-sections of all the scattering processes available at that energy coincides with the corresponding TCS. This cross-section data set is ready to be used for modelling electron-induced radiation damage at the molecular level to biologically relevant media containing 1M5NI as a potential radiosensitizer. Nonetheless, a proper evaluation of its radiosensitizing effects would require further radiobiological experiments.
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Affiliation(s)
- Ana I. Lozano
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas-CSIC, Serrano 113-bis, 28006 Madrid, Spain or (A.I.L.); (L.Á.); (A.G.-A.); (C.G.)
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal (P.L.-V.)
| | - Lidia Álvarez
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas-CSIC, Serrano 113-bis, 28006 Madrid, Spain or (A.I.L.); (L.Á.); (A.G.-A.); (C.G.)
| | - Adrián García-Abenza
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas-CSIC, Serrano 113-bis, 28006 Madrid, Spain or (A.I.L.); (L.Á.); (A.G.-A.); (C.G.)
| | - Carlos Guerra
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas-CSIC, Serrano 113-bis, 28006 Madrid, Spain or (A.I.L.); (L.Á.); (A.G.-A.); (C.G.)
| | - Fábris Kossoski
- Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, 31062 Toulouse, France;
| | - Jaime Rosado
- Departamento de Estructura de la Materia, Física Térmica y Electrónica e IPARCOS, Universidad Complutense de Madrid, Avenida Complutense, 28040 Madrid, Spain; (J.R.); (F.B.)
| | - Francisco Blanco
- Departamento de Estructura de la Materia, Física Térmica y Electrónica e IPARCOS, Universidad Complutense de Madrid, Avenida Complutense, 28040 Madrid, Spain; (J.R.); (F.B.)
| | - Juan Carlos Oller
- Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Avenida Complutense 22, 28040 Madrid, Spain;
| | - Mahmudul Hasan
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; (M.H.); (T.W.); (D.S.S.)
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;
| | - Martin Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;
| | - Thorsten Weber
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; (M.H.); (T.W.); (D.S.S.)
| | - Daniel S. Slaughter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; (M.H.); (T.W.); (D.S.S.)
| | | | - Alexander Dorn
- Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany; (D.M.M.)
| | - Sarvesh Kumar
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal (P.L.-V.)
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; (M.H.); (T.W.); (D.S.S.)
| | - Paulo Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal (P.L.-V.)
| | - Rafael Colmenares
- Servicio de Radiofísica, IRYCIS-Hospital Universitario Ramón y Cajal, Carretera de Colmenar Viejo Km. 9.100, 28034 Madrid, Spain
| | - Gustavo García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas-CSIC, Serrano 113-bis, 28006 Madrid, Spain or (A.I.L.); (L.Á.); (A.G.-A.); (C.G.)
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia
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2
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Su H, Cheng X, Cooper B, Tennyson J, Zhang H. Elastic and inelastic low-energy electron scattering from pyridine. J Chem Phys 2023; 158:024301. [PMID: 36641403 DOI: 10.1063/5.0127540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
A comprehensive investigation of elastic and inelastic electron scattering from molecular pyridine is reported using the ab initio R-matrix method with the static exchange plus polarization and close-coupling approximations for incident energies up to 10 eV. The two well-known low-lying 1 2B1 and 1 2A2 shape resonances as well as a 2 2B1 mixed-character resonance compare well with the theoretical and experimental results. We also detect five core-excited resonances (1 2A1, 1 2B2, 3 2B1, 2 2A2, and 4 2B1), which lie above the first electronic excitation threshold. The total elastic cross sections and momentum transfer cross sections agree reasonably with previous reference data. Comparisons of the differential elastic cross sections of pyridine with those measured for benzene, pyrazine, and pyrimidine show remarkable agreement at scattering angles above 40° but behave differently for forward scattering below 40° below 6 eV, due to the dominant effect of the permanent dipole moment on the differential cross section in the low energy region with narrow scattering angles. Inelastic electronic excitation cross sections are presented, showing the influence of core-excited resonances below the ionization threshold for the first time.
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Affiliation(s)
- He Su
- College of Physics, Sichuan University, Chengdu 610065, China
| | - Xinlu Cheng
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Bridgette Cooper
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Hong Zhang
- College of Physics, Sichuan University, Chengdu 610065, China
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3
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Barbosa AS. Low-Energy Positron Scattering by Pyridine and Aniline. J Phys Chem A 2022; 126:7924-7929. [DOI: 10.1021/acs.jpca.2c05928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandra Souza Barbosa
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, Curitiba, Paraná81531-980, Brazil
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4
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Sprayed water microdroplets containing dissolved pyridine spontaneously generate pyridyl anions. Proc Natl Acad Sci U S A 2022; 119:e2200991119. [PMID: 35286201 PMCID: PMC8944249 DOI: 10.1073/pnas.2200991119] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Water microdroplets can accelerate chemical reactions by orders of magnitude compared to the same reactions in bulk water and/or trigger spontaneous reactions that do not occur in bulk solution. Among the properties of water microdroplets, the unique redox ability resulting from the spontaneous dissociation of OH− into a released electron and •OH at the air–water interfaces is especially intriguing. At the air–water interface, OH− exhibits a strong reducing potential, and the resulting •OH is highly oxidative, making water microdroplets a unity of opposites. We report the reduction of pyridine into pyridyl anions (C5H5N−) and the oxidation of pyridine into hydroxypyridine, which extends what we know about the redox power of water microdroplets. The anion of pyridine, C5H5N−, has been thought to be short lived in the gas phase and was only previously observed indirectly. In the condensed phase, C5H5N− is known to be stabilized by solvation with other molecules. We provide in this study striking results for the formation of isolated C5H5N− from microdroplets of water containing dissolved pyridine observed in the negative ion mass spectrum. The gas-phase lifetime of C5H5N− is estimated to be at least 50 ms, which is much longer than previously thought. The generated C5H5N− captured CO2 molecules to form a stable (Py-CO2)− complex, further confirming the existence of C5H5N−. We propose that the high electric field at the air–water interface of a microdroplet helps OH− to transfer an electron to pyridine to form C5H5N− and the hydroxyl radical •OH. Oxidation products of the Py reacting with •OH are also observed in the mass spectrum recorded in positive mode, which further supports this mechanism. The present study pushes the limits of the reducing and oxidizing power of water microdroplets to a new level, emphasizing how different the behavior of microdroplets can be from bulk water. We also note that the easy formation of C5H5N− in water microdroplets presents a green chemistry way to synthesize value-added chemicals.
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5
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Cheong Z, Moreira GM, Bettega MHF, Blanco F, Garcia G, Brunger MJ, White RD, Sullivan JP. A comparison of experimental and theoretical low energy positron scattering from furan. J Chem Phys 2020; 153:244303. [PMID: 33380099 DOI: 10.1063/5.0027874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
This paper presents a joint experimental and theoretical study of positron scattering from furan. Experimental data were measured using the low energy positron beamline located at the Australian National University and cover an energy range from 1 eV to 30 eV. Cross sections were measured for total scattering, total elastic and inelastic scattering, positronium formation, and differential elastic scattering. Two theoretical approaches are presented: the Schwinger multichannel method and the independent atom method with screening corrected additivity rule. In addition, our data are compared to corresponding electron scattering results from the same target with a number of significant differences observed and discussed.
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Affiliation(s)
- Z Cheong
- Laser Physics Centre, Research School of Physics, Australian National University, Canberra, Australia
| | - G M Moreira
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-980 Curitiba, Paraná, Brazil
| | - M H F Bettega
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-980 Curitiba, Paraná, Brazil
| | - F Blanco
- Departamento de Fısica Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - G Garcia
- Instituto de Fısica Fundamental, Consejo Superior de Investigaciones Cientificas, Serrano 113-bis, 28006 Madrid, Spain
| | - M J Brunger
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - R D White
- College of Science and Engineering, James Cook University, Townsville, Qld., Australia
| | - J P Sullivan
- Laser Physics Centre, Research School of Physics, Australian National University, Canberra, Australia
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6
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A Complete Cross Section Data Set for Electron Scattering by Pyridine: Modelling Electron Transport in the Energy Range 0-100 eV. Int J Mol Sci 2020; 21:ijms21186947. [PMID: 32971806 PMCID: PMC7555704 DOI: 10.3390/ijms21186947] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 12/11/2022] Open
Abstract
Electron scattering cross sections for pyridine in the energy range 0–100 eV, which we previously measured or calculated, have been critically compiled and complemented here with new measurements of electron energy loss spectra and double differential ionization cross sections. Experimental techniques employed in this study include a linear transmission apparatus and a reaction microscope system. To fulfill the transport model requirements, theoretical data have been recalculated within our independent atom model with screening corrected additivity rule and interference effects (IAM-SCAR) method for energies above 10 eV. In addition, results from the R-matrix and Schwinger multichannel with pseudopotential methods, for energies below 15 eV and 20 eV, respectively, are presented here. The reliability of this complete data set has been evaluated by comparing the simulated energy distribution of electrons transmitted through pyridine, with that observed in an electron-gas transmission experiment under magnetic confinement conditions. In addition, our representation of the angular distribution of the inelastically scattered electrons is discussed on the basis of the present double differential cross section experimental results.
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7
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Singh S, Gupta D, Antony B, Tudorovskaya M, Tennyson J. Electron Scattering Cross Sections for Anthracene and Pyrene. J Phys Chem A 2020; 124:7088-7100. [PMID: 32786972 DOI: 10.1021/acs.jpca.0c05589] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UK molecular R-matrix calculations have been carried out for electron scattering from anthracene and pyrene. These molecules belong to the family of polycyclic hydrocarbons (PAHs) and are found in a nebula known as the Red Rectangle. Static exchange (SE), static exchange plus polarization (SEP), and close coupling (CC) approximations are used for scattering calculations. Different elastic and inelastic cross sections are computed in the present work in the energy range of 0.1-15 eV. Dissociative electron attachment cross sections are also calculated for both the molecules. Various shape, Feshbach/core-excited, and mixed resonances are detected for these molecules below 10 eV. All of the resonances detected in the present study are in agreement with the existing experimental and theoretical results. Due to the complexity of the present targets, electron collision cross sections are essentially unknown and hence most of the results are presented for the first time.
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Affiliation(s)
- Suvam Singh
- Atomic and Molecular Physics Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, JH 826004, India
| | - Dhanoj Gupta
- Plasma Technology Research Center, National Fusion Research Institute, 37 Dongjangsan-ro, Gunsan, Jeollabuk-do 54004, South Korea.,Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610010, Israel
| | - Bobby Antony
- Atomic and Molecular Physics Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, JH 826004, India
| | - Maria Tudorovskaya
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K
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8
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Gholami N, Hajivaliei M, Samei ME. Calculation of electron scattering cross sections for Anthracene, Pyridine and Warfarin molecules over energy range 10-30000 eV. Appl Radiat Isot 2019; 150:79-86. [PMID: 31128497 DOI: 10.1016/j.apradiso.2019.05.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 05/09/2019] [Accepted: 05/13/2019] [Indexed: 10/26/2022]
Abstract
This paper reports electron impact total cross section, total elastic, total inelastic and differential cross sections for molecules Anthracene, Pyridine and Warfarin having been computed using the independent atom model with screening-corrected additivity rule over an incident energy range of 10-30000 eV. The calculations are performed with relativistic (Dirac) partial-wave for scattering by applying a local central interaction potential V(r). A model spherical complex optical potential is used for calculations. Good agreement is achieved in intermediate and high-energy zones.
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Affiliation(s)
- Nasim Gholami
- Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan, 65178-38695, Iran.
| | - Mahdi Hajivaliei
- Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan, 65178-38695, Iran.
| | - Mohammad Esmael Samei
- Department of Mathematics, Faculty of Science, Bu-Ali Sina University, Hamedan, 65178-38695, Iran.
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9
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Lozano AI, Loupas A, Blanco F, Gorfinkiel JD, García G. Total electron scattering cross sections from thiophene for the (1-300 eV) impact energy range. J Chem Phys 2018; 149:134303. [DOI: 10.1063/1.5050349] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- A. I. Lozano
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-Bis, 28006 Madrid, Spain
- Escuela de Doctorado de la UNED-Programa de Doctorado en Ciencias, 28015 Madrid, Spain
| | - A. Loupas
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Lisbon, Portugal
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
| | - F. Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - J. D. Gorfinkiel
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
| | - G. García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-Bis, 28006 Madrid, Spain
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia
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10
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Szmytkowski C, Stefanowska S, Tańska N, Żywicka B, Ptasińska-Denga E, Możejko P. Cross sections for electron collision with pyridine [C5H5N] molecule. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1517908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Czesław Szmytkowski
- Department of Atomic, Molecular, and Optical Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland
| | - Sylwia Stefanowska
- Department of Atomic, Molecular, and Optical Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland
| | - Natalia Tańska
- Department of Atomic, Molecular, and Optical Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland
| | | | - Elżbieta Ptasińska-Denga
- Department of Atomic, Molecular, and Optical Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland
| | - Paweł Możejko
- Department of Atomic, Molecular, and Optical Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk, Poland
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11
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Loupas A, Lozano AI, Blanco F, Gorfinkiel JD, García G. Cross sections for electron scattering from thiophene for a broad energy range. J Chem Phys 2018; 149:034304. [DOI: 10.1063/1.5040352] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alexandra Loupas
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Lisbon, Portugal
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
| | - Ana. I. Lozano
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain
| | - Francisco Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain
| | - Jimena D. Gorfinkiel
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
| | - Gustavo García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain
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12
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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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13
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Dubuis AT, Costa F, da Silva FF, Limão-Vieira P, Oller J, Blanco F, García G. Total electron scattering cross section from pyridine molecules in the energy range 10–1000 eV. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.03.065] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Stevens D, Babij TJ, Machacek JR, Buckman SJ, Brunger MJ, White RD, García G, Blanco F, Ellis-Gibbings L, Sullivan JP. Positron scattering from pyridine. J Chem Phys 2018; 148:144308. [DOI: 10.1063/1.5024246] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. Stevens
- Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia
| | - T. J. Babij
- Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia
| | - J. R. Machacek
- Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia
| | - S. J. Buckman
- Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia
| | - M. J. Brunger
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - R. D. White
- College of Science and Engineering, James Cook University, Townsville, Qld., Australia
| | - G. García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain
| | - F. Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - L. Ellis-Gibbings
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain
| | - J. P. Sullivan
- Plasma Research Laboratory, Research School of Physics and Engineering, Australian National University, Acton, Canberra 2601, Australia
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15
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Ryszka M, Alizadeh E, Li Z, Ptasińska S. Low-energy electron-induced dissociation in gas-phase nicotine, pyridine, and methyl-pyrrolidine. J Chem Phys 2017; 147:094303. [DOI: 10.1063/1.4994679] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Michal Ryszka
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Elahe Alizadeh
- Department of Medical Imaging, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - Zhou Li
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Sylwia Ptasińska
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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16
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Sieradzka A, Gorfinkiel JD. Theoretical study of resonance formation in microhydrated molecules. I. Pyridine-(H2O)n, n = 1,2,3,5. J Chem Phys 2017; 147:034302. [DOI: 10.1063/1.4993941] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Agnieszka Sieradzka
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
| | - Jimena D. Gorfinkiel
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
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Chiari L, Zecca A, Blanco F, García G, Brunger MJ. Experimental and theoretical cross sections for positron scattering from the pentane isomers. J Chem Phys 2016; 144:084301. [PMID: 26931696 DOI: 10.1063/1.4942472] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Isomerism is ubiquitous in chemistry, physics, and biology. In atomic and molecular physics, in particular, isomer effects are well known in electron-impact phenomena; however, very little is known for positron collisions. Here we report on a set of experimental and theoretical cross sections for low-energy positron scattering from the three structural isomers of pentane: normal-pentane, isopentane, and neopentane. Total cross sections for positron scattering from normal-pentane and isopentane were measured at the University of Trento at incident energies between 0.1 and 50 eV. Calculations of the total cross sections, integral cross sections for elastic scattering, positronium formation, and electronic excitations plus direct ionization, as well as elastic differential cross sections were computed for all three isomers between 1 and 1000 eV using the independent atom model with screening corrected additivity rule. No definitive evidence of a significant isomer effect in positron scattering from the pentane isomers appears to be present.
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Affiliation(s)
- L Chiari
- Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - A Zecca
- Department of Physics, University of Trento, Via Sommarive 14, Povo, Trento 38123, Italy
| | - F Blanco
- Departamento de Física Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - G García
- Instituto de Física Fundamental, Consejo Superior de Investigationes Científicas (CSIC), Serrano 113-bis, 28006 Madrid, Spain
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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White AF, Head-Gordon M, McCurdy CW. Complex basis functions revisited: Implementation with applications to carbon tetrafluoride and aromatic N-containing heterocycles within the static-exchange approximation. J Chem Phys 2015; 142:054103. [DOI: 10.1063/1.4906940] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alec F. White
- Department of Chemistry, University of California, Berkeley and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C. William McCurdy
- Chemical Sciences and Ultrafast X-ray Science Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Chemistry, University of California, Davis, California 95616, USA
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