Effect of Thermal Energy on Ionization Efficiency Curves of Fragment Ions

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Abstract
The effect of thermal energy on the shape of photoionization‐efficiency curves is analyzed. Several methods for determining thresholds for dethermalized ionization‐efficiency curves are presented. The assumptions and approximations used are explicitly stated for each method. The effect of thermal energy on the photoionization‐efficiency curves of some alkanes is analyzed and the results are in fair agreement with the hypothesis that thermal energy is fully effective in the dissociation of the parent ions.