Electron scattering from H₂O: Elastic scattering

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M. A. Khakoo,¹ H. Silva,² J. Muse,¹ M. C. A. Lopes,² C. Winstead,³ and V. McKoy³
¹Department of Physics, California State University, Fullerton, California 92831, 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

Received 18 September 2008; published 19 November 2008

Differentialcross sections for elastic electron scattering from gaseous water arereported. The measurements are obtained using the relative flow methodwith He as the standard gas and a thin collimatingaperture source of gas instead of a conventional needle source.Differential cross sections were measured at incident energies of 1,2, 4, 6, 8, 10, 15, 20, 30, 50, and100 eV for scattering angles ranging from 5° to 130° andintegrated over angles to obtain integral cross sections. Corresponding calculationsof the differential cross section are carried out using theSchwinger multichannel method, employing extensive basis sets and considering polarizationand dipole-scattering effects. Whereas excellent qualitative agreement with past measurementsof differential cross sections is observed, our measurements are foundto be consistently in significant quantitative disagreement with these measurements.The present calculations, on the other hand, generally agree inmagnitude with previous results.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.78.052710
DOI:	10.1103/PhysRevA.78.052710
PACS:	34.80.Bm 34.80.Bm Elastic scattering of electrons/positrons by atoms and molecules YEAR: 2008
KEYWORDS:	helium, molecule-electron collisions, polarisation, water

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