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American Institute of Physics, The Journal of Chemical Physics, 10(142), p. 104304, 2015

DOI: 10.1063/1.4913824

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Electron collisions with phenol: Total, integral, differential, and momentum transfer cross sections and the role of multichannel coupling effects on the elastic channel

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This paper is available in a repository.

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Abstract

14 págs.; 12 figs.; 2 tabs. ; © 2015 AIP Publishing LLC. We report theoretical and experimental total cross sections for electron scattering by phenol (C6H5OH). The experimental data were obtained with an apparatus based in Madrid and the calculated cross sections with two different methodologies, the independent atom method with screening corrected additivity rule (IAM-SCAR), and the Schwinger multichannel method with pseudopotentials (SMCPP). The SMCPP method in the Nopen-channel coupling scheme, at the static-exchange-plus-polarization approximation, is employed to calculate the scattering amplitudes at impact energies ranging from 5.0 eV to 50 eV. We discuss the multichannel coupling effects in the calculated cross sections, in particular how the number of excited states included in the open-channel space impacts upon the convergence of the elastic cross sections at higher collision energies. The IAM-SCAR approach was also used to obtain the elastic differential cross sections (DCSs) and for correcting the experimental total cross sections for the so-called forward angle scattering effect. We found a very good agreement between our SMCPP theoretical differential, integral, and momentum transfer cross sections and experimental data for benzene (a molecule differing from phenol by replacing a hydrogen atom in benzene with a hydroxyl group). Although some discrepancies were found for lower energies, the agreement between the SMCPP data and the DCSs obtained with the IAM-SCAR method improves, as expected, as the impact energy increases. We also have a good agreement among the present SMCPP calculated total cross section (which includes elastic, 32 inelastic electronic excitation processes and ionization contributions, the latter estimated with the binary-encounter-Bethe model), the IAM-SCAR total cross section, and the experimental data when the latter is corrected for the forward angle scattering effect [Fuss et al., Phys. Rev. A 88, 042702 (2013)]. ; The authors acknowledge support from the Brazilian agency Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). R.F.da.C., M.T.do.N.V., E.M.de.O and M.A.P.L. acknowledge support from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP). The present SMCPP calculations were performed at IFGW-UNICAMP, LCPAD-UFPR, and LFTC-DFis-UFPR. M.H.F.B. acknowledges computational support from Professor Carlos de Carvalho. D.B.J. and M.J.B. acknowledge the Australian Research Council (ARC) for some financial support, in particular D.B.J. thanks the ARC for a Discovery Early Career Researcher Award. M.J.B. also thanks CNPq for his Special Visiting Professor award at the Federal University of Juiz de Fora. P.L.-V. acknowledges support from the Portuguese Foundation for Science and Technology, FCT-MEC though research Grant Nos. PEst-OE/FIS/UI0068/2014 and PTDC/FIS-ATO/1832/2012. ; Peer Reviewed