R. K. Janev and D. Reiter, Phys. Plasmas 11, 780 (2004) see also: R. K. Janev and D. Reiter, ``Collision processes of hydrocarbon species in hydrogen plasmas: II. The ethane and propane families'', Report FZ-Jülich Jül -4005, Forschungszentrum Jülich, Jülich Germany (Oct. 2002) ISSN 0944-2952. Copies may be ordered from: Forschungszentrum Jülich GmbH, Zentralbibliotek, D-52425 Jülich, Germany.