The ionization potential measured as a threshold to photoionization for benzene and the benzene-argon complex is shown to be a strong function of the applied electric field required to detect the ionization event. The ionization potential is lowered by moderate electric fields and the field dependence is found to be the same for the bare molecule and its Van der Waals complex. The data can be fitted with a square root dependence on the electric field and this shows that large molecules behave like atoms at the ionization threshold.
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Fung et al. (1981) studied this question.