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Phys. Rev. A 71, 032720 (2005) [6 pages]

Electron scattering cross sections for SF6 and SF5CF3 at intermediate and high energies (100–10000 eV)

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P. Limão-Vieira1,2, F. Blanco3, J. C. Oller4, A. Muñoz4, J. M. Pérez4, M. Vinodkumar2,5, G. García6,*, and N. J. Mason2
1Departamento de Física & Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal
2Centre of Molecular and Optical Sciences, Department of Physics and Astronomy, The Open University, Milton Keynes, MK 6AA, United Kingdom
3Departamento de Física Atómica, Molecular y Nuclear, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Avenida Complutense s/n, 28040 Madrid, Spain
4Centro de Investigaciones Energéticas Medioambientales y Tecnológicas, Avenida Complutense 22, 28040 Madrid, Spain
5V. P. & R.P.T.P. Science College, Vallabh Vidyanagr, 388 120, Gujarat, India
6Instituto de Matemáticas y Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain

Received 8 November 2004; published 28 March 2005

A modified experimental apparatus with improved angular resolution and stability has been used to measure the total electron scattering cross sections for SF6 and SF5CF3 in the energy range of 100–5000 eV. A detailed analysis of the experimental error sources is provided. The experimental results are compared with integral elastic and inelastic cross sections calculated using the independent atom model approximation and a modified single-center additivity rule for electron energies ranging from 1 to 10,000 eV. The accuracy of these approximations method is discussed through a comparison with the experimental results. Previous cross-sectional data for SF6 are compared with the present theoretical and experimental results. For SF5CF3, we present the first electron scattering cross-sectional data for the 100–10,000 eV energy range, as well as the first empirical determination of the molecular polarizability.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.032720
DOI:
10.1103/PhysRevA.71.032720
PACS:
34.80.−i

*Corresponding author: G.Garcia, Instituto de Matematicas y Fisica Fundamental, Consejo Superior de Investigaciones Cientificas, Serrano 113-bis, 28006 Madrid, Spain. Email address: g.garcia@imaff.cfmac.csic.es

 
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