Elastic scattering of slow electrons by n-propanol and n-butanol

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M. A. Khakoo,¹ J. Muse,¹ H. Silva,² M. C. A. Lopes,² C. Winstead,³ V. McKoy,³ E. M. de Oliveira,⁴ R. F. da Costa,⁴ M. T. do N. Varella,⁵ M. H. F. Bettega,⁶ and M. A. P. Lima^4,7
¹Department of Physics, California State University, Fullerton, California 92834, USA
²Departamento de Física, ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG, CEP 36036-330, Brazil
³A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA
⁴Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Caixa Postal 6165, 13083-970, Campinas, São Paulo, Brazil
⁵Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adélia, 166, 09210-170, Santo André, São Paulo, Brazil
⁶Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Paraná, Brazil
⁷Centro de Ciência e Tecnologia do Bioetanol CTBE, Caixa Postal 6170, 13083-970, Campinas, São Paulo, Brazil

Received 25 September 2008; published 23 December 2008

Wereport measured and calculated cross sections for elastic scattering oflow-energy electrons by the alcohols n-propanol and n-butanol in thegas phase. The measurements were carried out using the relative-flowmethod with an aperture source rather than a conventional tubeor capillary-array source, eliminating the need to know molecular diameters.The calculations employed two different implementations of the Schwinger multichannelvariational method and included polarization effects. The differential cross sectionsare dominated by strong forward scattering due to the molecules'large electric dipole moments, but near 10 eV, they display structureat intermediate angles that is probably associated with shape resonances,notably a pronounced f-wave scattering pattern. Overall agreement between themeasured and calculated results is fair. We compare the crosssections of these larger alcohols to those of methanol andethanol, as well as to those of alkanes.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.78.062714
DOI:	10.1103/PhysRevA.78.062714
PACS:	34.80.Bm 34.80.Bm Elastic scattering of electrons/positrons by atoms and molecules YEAR: 2008
KEYWORDS:	electric moments, molecular moments, molecule-electron collisions, organic compounds, variational techniques

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