Cyclopentane equivalent hydrogens

Several conclusions follow from the present results (i) The per-bond nonthermal F-to-HF reactivities for Ci-Ce alkanes are roughly equivalent. Steric and/or bond strength eflFects in these substances may give rise to 10-15% reactivity diflFerences, (ii) The deuterium kinetic isotope eflFects for the per-bond nonthermal F-to-HF (DF) reactivities are quite small for cyclopentane and C2-C5 alkanes, (iii) The nonthermal corrections to the MNR H F yields for low-reactivity hydrogen donors are negligibly small, and (iv) For reactive hydrocarbons the uniform per-bond reactivity model may be combined with the simple collision fraction mixture law and hard sphere elastic cross sections obtained from gas-liquid critical data to estimate the nonthermal H F yield corrections in MNR experiments. The simple mixture law should provide a good description of the trace nonthermal yields in experiments in which the total thermal competitor concentration is held constant. 

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