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Mendes M, Pamplona B, Kumar S, da Silva FF, Aguilar A, García G, Bacchus-Montabonel MC, Limao-Vieira P. Ion-Pair Formation in Neutral Potassium-Neutral Pyrimidine Collisions: Electron Transfer Experiments. Front Chem 2019; 7:264. [PMID: 31058139 PMCID: PMC6482480 DOI: 10.3389/fchem.2019.00264] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 04/01/2019] [Indexed: 11/13/2022] Open
Abstract
We report novel data on ion-pair formation in hyperthermal (30–800 eV) neutral potassium collisions with neutral pyrimidine (Pyr, C4H4N2) molecules. In this collision regime, negative ions formed by electron transfer from the alkali atom to the target molecule were time-of-flight mass analyzed and the fragmentation patterns and branching ratios have been obtained. The most abundant product anions have been assigned to CN− and C2H− and the electron transfer mechanisms are comprehensively discussed. Particular importance is also given to the efficient loss of integrity of the pyrimidine ring in the presence of an extra electron, which is in contrast to dissociative electron attachment experiments yielding the dehydrogenated parent anion. Theoretical calculations were performed for pyrimidine in the presence of a potassium atom and provided a strong basis for the assignment of the lowest unoccupied molecular orbitals accessed in the collision process. In order to further our knowledge about the collision dynamics, potassium cation (K+) energy loss spectrum has been obtained and within this context, we also discuss the role of the accessible electronic states. A vertical electron affinity of (−5.69 ± 0.20) eV was obtained and may be assigned to a π3*(b1) state that leads to CN− formation.
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Affiliation(s)
- Mónica Mendes
- Atomic and Molecular Collisions Laboratory, Centre of Physics and Technological Research (CEFITEC), Department of Physics, Universidade NOVA de Lisboa, Costa de Caparica, Portugal.,Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Beatriz Pamplona
- Atomic and Molecular Collisions Laboratory, Centre of Physics and Technological Research (CEFITEC), Department of Physics, Universidade NOVA de Lisboa, Costa de Caparica, Portugal
| | - Sarvesh Kumar
- Atomic and Molecular Collisions Laboratory, Centre of Physics and Technological Research (CEFITEC), Department of Physics, Universidade NOVA de Lisboa, Costa de Caparica, Portugal
| | - Filipe Ferreira da Silva
- Atomic and Molecular Collisions Laboratory, Centre of Physics and Technological Research (CEFITEC), Department of Physics, Universidade NOVA de Lisboa, Costa de Caparica, Portugal
| | - Antonio Aguilar
- Departament de Ciència de Materials i Química Física, Universitat de Barcelona, Barcelona, Spain
| | - Gustavo García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | | | - Paulo Limao-Vieira
- Atomic and Molecular Collisions Laboratory, Centre of Physics and Technological Research (CEFITEC), Department of Physics, Universidade NOVA de Lisboa, Costa de Caparica, Portugal
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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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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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Jones DB, da Costa RF, Kossoski F, Varella MTDN, Bettega MHF, Ferreira da Silva F, Limão-Vieira P, García G, Lima MAP, White RD, Brunger MJ. Electron-impact electronic-state excitation of para-benzoquinone. J Chem Phys 2018; 148:124312. [DOI: 10.1063/1.5023494] [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)
- D. B. Jones
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - R. F. da Costa
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
- Centro de Ciências Exatas, Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Espírito Santo, Brazil
| | - F. Kossoski
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - M. T. do N. Varella
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, 05508-090 São Paulo, São Paulo, Brazil
| | - M. H. F. Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil
| | - F. Ferreira da Silva
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - P. Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - G. García
- Instituto de Fisica Fundamental, CSIC, Serrano 113-bis, E-28006 Madrid, Spain
| | - M. A. P. Lima
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - R. D. White
- College of Science and Engineering, James Cook University, Townsville, Australia
| | - M. J. Brunger
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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Ellis-Gibbings L, Bass AD, Cloutier P, García G, Sanche L. Electron stimulated desorption from condensed pyrimidine and pyridazine. Phys Chem Chem Phys 2018; 19:13038-13048. [PMID: 28484763 DOI: 10.1039/c7cp00715a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Low energy electron (LEE) interactions and the formation of transient negative ions play a dominant role in radiation-induced dissociation of condensed-phase biomolecules (e.g. in radiotherapy). Here we present data on the LEE-induced dissociation and desorption of the DNA/RNA-base and radiosensitizing agent analogues pyrimidine and pyridazine. Vapors of each molecule were condensed on either a Pt or Ar substrate to form a multilayer film or a submonolayer molecular target, respectively. These were irradiated with electrons of 0-80 eV and the desorbing anionic and cationic fragments analysed via time of flight mass spectrometry. The detected cations are the same species seen in gas-phase mass spectra, albeit of differing relative intensity. Anion yield functions exhibit strong maxima, indicating that transient negative ions contribute significantly, via dissociative electron attachment (DEA), to molecular dissociation below 20 eV. For both molecules, the <5 eV shape resonances, seen experimentally and predicted by theory, do not result in fragment desorption. The main anionic fragments are H- and CN- for both molecules, additionally the fragments C-, CH- C2H- and CHN- desorb from pyrimidine and C- and C2H- from pyridazine, with some resonances lying above the ionization limit. Pyrimidine shows higher anion desorption yields than pyridazine for all species except H-. The anion signal also comprises dipolar dissociation (DD), investigated in both anionic and cationic yield functions. From analysis of anion and cation yields, fragmentation pathways are suggested. The direct ionization pathway provides information on the appearance energies for cations and their production processes in condensed phase.
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Affiliation(s)
- L Ellis-Gibbings
- Fundamental Physics Institute, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain.
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Jones DB, Blanco F, García G, da Costa RF, Kossoski F, Varella MTDN, Bettega MHF, Lima MAP, White RD, Brunger MJ. Elastic scattering and vibrational excitation for electron impact onpara-benzoquinone. J Chem Phys 2017; 147:244304. [DOI: 10.1063/1.5010831] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- D. B. Jones
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
| | - F. Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, Madrid E-28040, Spain
| | - G. García
- Instituto de Física Fundamental, CSIC, Serano 113-bis, E-28006 Madrid, Spain
| | - R. F. da Costa
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, Campinas, São Paulo 13083-859, Brazil
- Centro de Ciências Exatas, Departamento de Física, Universidade Federal do Espírito Santo, 29075-901 Vitória, Espírito Santo, Brazil
| | - F. Kossoski
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, Campinas, São Paulo 13083-859, Brazil
| | - M. T. do N. Varella
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, São Paulo 05508-090, Brazil
| | - M. H. F. Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, Curitiba, Paraná 81531-990, Brazil
| | - M. A. P. Lima
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, Campinas, São Paulo 13083-859, Brazil
| | - R. D. White
- College of Science and Engineering, James Cook University, Townsville, Qld 4811, Australia
| | - M. J. Brunger
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
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Brunger MJ. Electron scattering and transport in biofuels, biomolecules and biomass fragments. INT REV PHYS CHEM 2017. [DOI: 10.1080/0144235x.2017.1301030] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Jones DB, Neves RFC, Lopes MCA, da Costa RF, do N Varella MT, Bettega MHF, Lima MAP, García G, Limão-Vieira P, Brunger MJ. Theoretical and experimental differential cross sections for electron impact excitation of the electronic bands of furfural. J Chem Phys 2016; 144:124309. [PMID: 27036450 DOI: 10.1063/1.4944615] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report results from a joint experimental and theoretical investigation into electron scattering from the important industrial species furfural (C5H4O2). Specifically, differential cross sections (DCSs) have been measured and calculated for the electron-impact excitation of the electronic states of C5H4O2. The measurements were carried out at energies in the range 20-40 eV, and for scattered-electron angles between 10° and 90°. The energy resolution of those experiments was typically ∼80 meV. Corresponding Schwinger multichannel method with pseudo-potential calculations, for energies between 6-50 eV and with and without Born-closure, were also performed for a sub-set of the excited electronic-states that were accessed in the measurements. Those calculations were undertaken at the static exchange plus polarisation-level using a minimum orbital basis for single configuration interaction (MOB-SCI) approach. Agreement between the measured and calculated DCSs was qualitatively quite good, although to obtain quantitative accord, the theory would need to incorporate even more channels into the MOB-SCI. The role of multichannel coupling on the computed electronic-state DCSs is also explored in some detail.
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Affiliation(s)
- D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - R F C Neves
- Instituto Federal do Sul de Minas Gerais, Câmpus Poços de Caldas, Minas Gerais, Brazil
| | - M C A Lopes
- Departamento de Física, UFJF, Juiz de Fora, Minas Gerais 36036-900, Brazil
| | - R F da Costa
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, São Paulo 09210-580, Brazil
| | - M T do N Varella
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, Brazil
| | - M H F Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, Curitiba, Paraná 81531-990, Brazil
| | - M A P Lima
- Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, Campinas, São Paulo 13083-859, Brazil
| | - G García
- Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
| | - P Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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Regeta K, Allan M, Mašín Z, Gorfinkiel JD. Absolute cross sections for electronic excitation of pyrimidine by electron impact. J Chem Phys 2016; 144:024302. [DOI: 10.1063/1.4939077] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Khrystyna Regeta
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
| | - Michael Allan
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
| | - Zdeněk Mašín
- Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2A, 12489 Berlin, Germany
| | - Jimena D. Gorfinkiel
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
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Jones DB, Neves RFC, Lopes MCA, da Costa RF, Varella MTDN, Bettega MHF, Lima MAP, García G, Blanco F, Brunger MJ. Excitation of vibrational quanta in furfural by intermediate-energy electrons. J Chem Phys 2015; 143:224304. [PMID: 26671372 DOI: 10.1063/1.4936631] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report cross sections for electron-impact excitation of vibrational quanta in furfural, at intermediate incident electron energies (20, 30, and 40 eV). The present differential cross sections are measured over the scattered electron angular range 10°-90°, with corresponding integral cross sections subsequently being determined. Furfural is a viable plant-derived alternative to petrochemicals, being produced via low-temperature plasma treatment of biomass. Current yields, however, need to be significantly improved, possibly through modelling, with the present cross sections being an important component of such simulations. To the best of our knowledge, there are no other cross sections for vibrational excitation of furfural available in the literature, so the present data are valuable for this important molecule.
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Affiliation(s)
- D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
| | - R F C Neves
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
| | - M C A Lopes
- Departamento de Física, Universidade Federal de Juiz de Fora, 36036-900, Juiz de Fora, MG, Brazil
| | - R F da Costa
- Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, Campinas, 13083-859 São Paulo, Brazil
| | - M T do N Varella
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, São Paulo, Brazil
| | - M H F Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil
| | - M A P Lima
- Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, Campinas, 13083-859 São Paulo, Brazil
| | - G García
- Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
| | - F Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, Madrid E-28040, Spain
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
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Jones DB, Ellis-Gibbings L, García G, Nixon KL, Lopes MCA, Brunger MJ. Intermediate energy cross sections for electron-impact vibrational-excitation of pyrimidine. J Chem Phys 2015; 143:094304. [PMID: 26342367 DOI: 10.1063/1.4929907] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report differential cross sections (DCSs) and integral cross sections (ICSs) for electron-impact vibrational-excitation of pyrimidine, at incident electron energies in the range 15-50 eV. The scattered electron angular range for the DCS measurements was 15°-90°. The measurements at the DCS-level are the first to be reported for vibrational-excitation in pyrimidine via electron impact, while for the ICS we extend the results from the only previous condensed-phase study [P. L. Levesque, M. Michaud, and L. Sanche, J. Chem. Phys. 122, 094701 (2005)], for electron energies ⩽12 eV, to higher energies. Interestingly, the trend in the magnitude of the lower energy condensed-phase ICSs is much smaller when compared to the corresponding gas phase results. As there is no evidence for the existence of any shape-resonances, in the available pyrimidine total cross sections [Baek et al., Phys. Rev. A 88, 032702 (2013); Fuss et al., ibid. 88, 042702 (2013)], between 10 and 20 eV, this mismatch in absolute magnitude between the condensed-phase and gas-phase ICSs might be indicative for collective-behaviour effects in the condensed-phase results.
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Affiliation(s)
- D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - L Ellis-Gibbings
- Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
| | - G García
- Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
| | - K L Nixon
- Departamento de Física, Universidade Federal de Juiz de Fora, 36036-330 Juiz de Fora, Minas Gerais, Brazil
| | - M C A Lopes
- Departamento de Física, Universidade Federal de Juiz de Fora, 36036-330 Juiz de Fora, Minas Gerais, Brazil
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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Neves RFC, Jones DB, Lopes MCA, Blanco F, García G, Ratnavelu K, Brunger MJ. Integral cross sections for electron impact excitation of vibrational and electronic states in phenol. J Chem Phys 2015; 142:194305. [PMID: 26001459 DOI: 10.1063/1.4921313] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on measurements of integral cross sections (ICSs) for electron impact excitation of a series of composite vibrational modes and electronic-states in phenol, where the energy range of those experiments was 15-250 eV. There are currently no other results against which we can directly compare those measured data. We also report results from our independent atom model with screened additivity rule correction computations, namely, for the inelastic ICS (all discrete electronic states and neutral dissociation) and the total ionisation ICS. In addition, for the relevant dipole-allowed excited electronic states, we also report f-scaled Born-level and energy-corrected and f-scaled Born-level (BEf-scaled) ICS. Where possible, our measured and calculated ICSs are compared against one another with the general level of accord between them being satisfactory to within the measurement uncertainties.
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Affiliation(s)
- R F C Neves
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
| | - D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
| | - M C A Lopes
- Departamento de Física, Universidade Federal de Juiz de Fora, 36036-330 Juiz de Fora, Minas Gerais, Brazil
| | - F Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - G García
- Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
| | - K Ratnavelu
- Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
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Neves RFC, Jones DB, Lopes MCA, Nixon KL, da Silva GB, Duque HV, de Oliveira EM, da Costa RF, Varella MTDN, Bettega MHF, Lima MAP, Ratnavelu K, García G, Brunger MJ. Differential cross sections for electron impact excitation of the electronic bands of phenol. J Chem Phys 2015; 142:104305. [DOI: 10.1063/1.4913825] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- R. F. C. Neves
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
- Instituto Federal do Sul de Minas Gerais, Campus Poços de Caldas, Minas Gerais, Brazil
- Departamento de Física, UFJF, Juiz de Fora, Minas Gerais, Brazil
| | - D. B. Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
| | - M. C. A. Lopes
- Departamento de Física, UFJF, Juiz de Fora, Minas Gerais, Brazil
| | - K. L. Nixon
- Departamento de Física, UFJF, Juiz de Fora, Minas Gerais, Brazil
| | - G. B. da Silva
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
- Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil
| | - H. V. Duque
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
- Departamento de Física, UFJF, Juiz de Fora, Minas Gerais, Brazil
| | - E. M. de Oliveira
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - R. F. da Costa
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, São Paulo, Brazil
| | - M. T. do N. Varella
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, Brazil
| | - M. H. F. Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil
| | - M. A. P. Lima
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - K. Ratnavelu
- Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - G. García
- Instituto de Física Fundamental, CSIC, Madrid E-28006, Spain
| | - M. J. Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia
- Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Linert I, Zubek M. A study of the electronic states of pyrimidine by electron energy loss spectroscopy. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.02.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Jones DB, da Silva GB, Neves RFC, Duque HV, Chiari L, de Oliveira EM, Lopes MCA, da Costa RF, Varella MTDN, Bettega MHF, Lima MAP, Brunger MJ. An experimental and theoretical investigation into the excited electronic states of phenol. J Chem Phys 2014; 141:074314. [DOI: 10.1063/1.4893116] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. B. Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - G. B. da Silva
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
- Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil
| | - R. F. C. Neves
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
- Departamento de Física, UFJF, Juiz de Fora, MG, Brazil
- Instituto Federal do Sul de Minas Gerais, Campus Poços de Caldas, Minas Gerais, Brazil
| | - H. V. Duque
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
- Departamento de Física, UFJF, Juiz de Fora, MG, Brazil
| | - L. Chiari
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - E. M. de Oliveira
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | | | - R. F. da Costa
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, São Paulo, Brazil
| | - M. T. do N. Varella
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, Brazil
| | - M. H. F. Bettega
- Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil
| | - M. A. P. Lima
- Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil
| | - M. J. Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
- Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
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17
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Chiari L, Duque HV, Jones DB, Thorn PA, Pettifer Z, da Silva GB, Limão-Vieira P, Duflot D, Hubin-Franskin MJ, Delwiche J, Blanco F, García G, Lopes MCA, Ratnavelu K, White RD, Brunger MJ. Differential cross sections for intermediate-energy electron scattering from α-tetrahydrofurfuryl alcohol: excitation of electronic-states. J Chem Phys 2014; 141:024301. [PMID: 25028013 DOI: 10.1063/1.4885856] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on measurements of differential cross sections (DCSs) for electron impact excitation of a series of Rydberg electronic-states in α-tetrahydrofurfuryl alcohol (THFA). The energy range of these experiments was 20-50 eV, while the scattered electron was detected in the 10°-90° angular range. There are currently no other experimental data or theoretical computations against which we can directly compare the present measured results. Nonetheless, we are able to compare our THFA DCSs with earlier cross section measurements for Rydberg-state electronic excitation for tetrahydrofuran, a similar cyclic ether, from Do et al. [J. Chem. Phys. 134, 144302 (2011)]. In addition, "rotationally averaged" elastic DCSs, calculated using our independent atom model with screened additivity rule correction approach are also reported. Those latter results give integral cross sections consistent with the optical theorem, and supercede those from the only previous study of Milosavljević et al. [Eur. Phys. J. D 40, 107 (2006)].
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Affiliation(s)
- L Chiari
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - H V Duque
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - P A Thorn
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Z Pettifer
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - G B da Silva
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - P Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - D Duflot
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Université Lille, F-59655 Villeneuve d'Ascq Cedex, France
| | - M-J Hubin-Franskin
- Départment de Chimie, Université de Liège, Institut de Chimie-Bât. B6C, B-4000 Liège 1, Belgium
| | - J Delwiche
- Départment de Chimie, Université de Liège, Institut de Chimie-Bât. B6C, B-4000 Liège 1, Belgium
| | - F Blanco
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, Madrid E-28040, Spain
| | - G García
- Instituto de Física Fundamental, CSIC, Madrid E-28006, Spain
| | - M C A Lopes
- Departamento de Física, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - K Ratnavelu
- Institute of Mathematical Sciences, University of Malaya, Kuala Lumpur, Malaysia
| | - R D White
- School of Engineering and Physical Sciences, James Cook University, Townsville, 4810 Queensland, Australia
| | - M J Brunger
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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18
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Duque H, Chiari L, Jones D, Thorn P, Pettifer Z, da Silva G, Limão-Vieira P, Duflot D, Hubin-Franskin MJ, Delwiche J, Blanco F, García G, Lopes M, Ratnavelu K, White R, Brunger M. Cross sections for electron scattering from α-tetrahydrofurfuryl alcohol. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.087] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Sanz AG, Fuss MC, Blanco F, Gorfinkiel JD, Almeida D, da Silva FF, Limão-Vieira P, Brunger MJ, García G. An investigation into electron scattering from pyrazine at intermediate and high energies. J Chem Phys 2013; 139:184310. [DOI: 10.1063/1.4829771] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Sanz AG, Fuss MC, Blanco F, Carelli F, Sebastianelli F, Gianturco FA, García G. Electron scattering cross sections from anthracene over a broad energy range (0.00001-10,000 eV). Appl Radiat Isot 2013; 83 Pt B:68-76. [PMID: 23352824 DOI: 10.1016/j.apradiso.2012.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 12/19/2012] [Accepted: 12/27/2012] [Indexed: 10/27/2022]
Abstract
We report a computational investigation of electron scattering by anthracene (C14H10) in the gas phase. Integral and differential cross sections have been calculated by employing two distinct ab-initio quantum scattering methods: the symmetry adapted-single centre expansion method (ePOLYSCAT) and a screening corrected form of the independent atom model (IAM-SCAR) at low and high energies, respectively. After a detailed evaluation of the current results, we present a complete set of integral scattering cross sections from 0.00001 to 10,000 eV.
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Affiliation(s)
- A G Sanz
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain.
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21
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Jones DB, Bellm SM, Blanco F, Fuss M, García G, Limão-Vieira P, Brunger MJ. Differential cross sections for the electron impact excitation of pyrimidine. J Chem Phys 2013; 137:074304. [PMID: 22920117 DOI: 10.1063/1.4743961] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on differential cross section (DCS) measurements for the electron-impact excitation of the electronic states of pyrimidine. The energy range of the present measurements was 15-50 eV with the angular range of the measurements being 10°-90°. All measured DCSs displayed forward-peaked angular distributions, consistent with the relatively large magnitudes for the dipole moment and dipole polarizability of pyrimidine. Excitations to triplet states were found to be particularly important in some energy loss features at the lower incident electron energies. To the best of our knowledge there are no other experimental data or theoretical computations against which we can compare the present results.
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Affiliation(s)
- D B Jones
- School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.
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22
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Palihawadana P, Sullivan JP, Buckman SJ, Brunger MJ. Electron scattering from pyrazine: Elastic differential and integral cross sections. J Chem Phys 2012. [DOI: 10.1063/1.4767570] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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