Table 1: Basic properties of the selected PAHs: ionization potential IP (eV) and number of carbon atoms $N_{\rm C}$. The two adopted types (1) and (2) correspond to two PAH symmetry groups (i.e. geometric structure) (D6h coronenes and D2h acenes) that have a different IP-$N_{\rm C}$ dependence. Type (2) PAHs are more easily ionized than type (1). See also Fig. B.1. in Ruiterkamp et al. (2005). We assume a generic electron affinity of 3 eV, and a sticking coefficient of unity.

\begin{displaymath}\begin{tabular}{lrrrl} \hline\hline \char93 & $N_{\rm C}$ & \... ...\Large \} } } \multirow{1}*{very large} \\ \hline \end{tabular}\end{displaymath}


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