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Electron Collision Cross Sections Derived from Critically Assessed Data



Loucas G. Christophorou, James K. Olthoff


Electron-molecule collisions are among the most fundamental processes in gas discharges. They are also the precursors of the ions and the radicals which drive the etch, cleaning, or deposition processes in plasma reactors. Hence, there is a need for a quantitative understanding of the fundamental electron collision processes in terms of cross sections. Unfortunately, cross sections for critical electron-collision processes often are not known. In this paper cross sections are reported for indirect (resonance enhanced) electron-impact vibrational excitation of the plasma processing gases CF4 and Cl2, and for total electron scattering for CF4 below difference} 1 eV. None of these cross sections are presently known from direct measurements. Their determination was made by a critical assessment of other electron collision cross sections for these molecules. Also reported are swarm-adjusted electron-beam attachment cross sections for Cl2.
Proceedings Title
Proc. XXIV Intl. Conf. on the Physics of Ionized Gases (ICPIG)
Conference Dates
July 11-16, 1999
Conference Location
Warsaw, 1, PL


CF<sub>4</sub>, Cl<sub>2</sub>, cross sections, dissociative attachment, electron scattering, vibrational excitation


Christophorou, L. and Olthoff, J. (1999), Electron Collision Cross Sections Derived from Critically Assessed Data, Proc. XXIV Intl. Conf. on the Physics of Ionized Gases (ICPIG), Warsaw, 1, PL, [online], (Accessed June 25, 2024)


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Created June 30, 1999, Updated October 12, 2021