Low-energy electron scattering from methanol and ethanol

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M. A. Khakoo,¹ J. Blumer,² K. Keane,¹ C. Campbell,¹ H. Silva,³ M. C. A. Lopes,³ C. Winstead,⁴ V. McKoy,⁴ R. F. da Costa,⁵ L. G. Ferreira,⁶ M. A. P. Lima,⁵ and M. H. F. Bettega⁷
¹Department of Physics, California State University, Fullerton, California 92831, USA
²Department of Mechanical Engineering, Brigham Young University, Provo, Utah 84602, USA
³Departamento de Física, ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG, CEP 36036-330, Brazil
⁴A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA
⁵Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas, Caixa Postal 6165, 13083-970, Campinas, São Paulo, Brazil
⁶Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05315-970, São Paulo, São Paulo, Brazil
⁷Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Paraná, Brazil

Received 23 January 2008; published 9 April 2008

Measuredand calculated differential cross sections for elastic (rotationally unresolved) electronscattering from two primary alcohols, methanol (CH₃OH) and ethanol (C₂H₅OH),are reported. The measurements are obtained using the relative flowmethod with helium as the standard gas and a thinaperture as the collimating target gas source. The relative flowmethod is applied without the restriction imposed by the relativeflow pressure conditions on helium and the unknown gas. Theexperimental data were taken at incident electron energies of 1,2, 5, 10, 15, 20, 30, 50, and 100 eV andfor scattering angles of 5°–130°. There are no previous reportsof experimental electron scattering differential cross sections for CH₃OH andC₂H₅OH in the literature. The calculated differential cross sections areobtained using two different implementations of the Schwinger multichannel method,one that takes all electrons into account and is adaptedfor parallel computers, and another that uses pseudopotentials and considersonly the valence electrons. Comparison between theory and experiment showsthat theory is able to describe low-energy electron scattering fromthese polyatomic targets quite well.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.77.042705
DOI:	10.1103/PhysRevA.77.042705
PACS:	34.80.Bm 34.80.Bm Elastic scattering of electrons/positrons by atoms and molecules YEAR: 2008
KEYWORDS:	molecule-electron collisions, organic compounds

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