A study of the kinetics of selected proton transfer reactions proceeding in a flowing afterglow at 300°K has led to the proton affinity order PA(CO) > PA(N2O) > PA(CH4) > PA(CO2) > PA(NO) > PA(N2) > PA(H2) > PA(O2) > PA(Ar) and the order PA(CH4) > PA(CF4) > PA(N2). A comparison of these orders with established values for proton affinity reported in the literature has led to the following proton affinity limits: 3.4 eV<PA(Ar) <4.2 eV; 4.9 eV<PA(N2) <5.5 eV; 5.5 eV<PA(N2O) <6.1 eV; and 4.9 eV<PA(CF4) <5.5 eV. In most cases these limits represent a considerable improvement over previously available information on proton affinities.
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Roche et al. (1971) studied this question.