Rate constant of the recombination of CF3• radicals in a gas (He, Ar, N2, or CF3I)

From recent rate constant data for the recombination reaction 2CF3• → C2F6 (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ k_{(CF_3 )_2 }^M $$\end{document}) in the high-pressure limit and from experimental data obtained at intermediate pressures of buffer gases M (M = He, Ar, N2, CF3I), analytical expressions for \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ k_{(CF_3 )_2 }^M $$\end{document} (in Lindemann’s formulation) are derived for the temperature range of 300–1300 K and intermediate pressures of the buffer gases.