Table 1.

For doubly ionized PAH cations, PAH⁺ → PAH²⁺, values of the theoretical adiabatic ionization potentials, IP²⁺, and measured appearance energies, AE²⁺. We also list here our recorded AE³⁺ as obtained from the ionization of PAH²⁺ → PAH³⁺.

Formula	IP2+ [eV]	AE2+ [eV]	AE3+ [eV]
${\text{C}}_{30}{\text{H}}_{14}^{+}$	9.66a	10.2 ± 0.1	14.1 ± 0.2
${\text{C}}_{32}{\text{H}}_{14}^{+}$	9.82a	10.0 ± 0.1	13.9 ± 0.2
${\text{C}}_{36}{\text{H}}_{18}^{+}$	9.94b	10.0 ± 0.1	13.9 ± 0.2
${\text{C}}_{48}{\text{H}}_{20}^{+}$	8.84a	9.1 ± 0.2	−c

Notes.

^(a)Taken from Malloci et al. (2007a).

^(b)Calculated for this work according to Malloci et al. (2004).

^(c)Trication peak out of mass range.