title: Electron collisions with phenol: Total, integral, differential, and momentum transfer cross sections and the role of multichannel coupling effects on the elastic channel.
abstract: 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)].
authors.affiliation: Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil.
authors.forename: Romarly F
authors.initials: RF
authors.lastname: da Costa
authors.affiliation: Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil.
authors.forename: Eliane M
authors.initials: EM
authors.lastname: de Oliveira
authors.affiliation: Departamento de Física, Universidade Federal do Paraná, CP 19044, 81531-990 Curitiba, Paraná, Brazil.
authors.forename: Márcio H F
authors.initials: MH
authors.lastname: Bettega
authors.affiliation: Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, São Paulo, Brazil.
authors.forename: Márcio T do N
authors.initials: MT
authors.lastname: Varella
authors.affiliation: School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia.
authors.forename: Darryl B
authors.initials: DB
authors.lastname: Jones
authors.affiliation: School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide SA 5001, Australia.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Brunger
authors.affiliation: Departamento de Fisica Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, Ciudad Universitaria, 2840 Madrid, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Blanco
authors.affiliation: Hospital Ramón y Cajal, 28034 Madrid, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Colmenares
authors.affiliation: Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Paulo
authors.initials: P
authors.lastname: Limão-Vieira
authors.affiliation: Instituto de Fisica Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain.
authors.forename: Gustavo
authors.initials: G
authors.lastname: García
authors.affiliation: Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, 13083-859 Campinas, São Paulo, Brazil.
authors.forename: Marco A P
authors.initials: MA
authors.lastname: Lima