Fig. 5: Mass-selected threshold photoelectron (ms-TPE) spectra.

Photoion ms-TPE spectra relevant to the formation of benzocorannulene at m/z = 300 (C24H12). Black: experimentally derived ms-TPE spectrum; blue: benzocorannulene ms-TPE spectrum; red: Franck-Condon (FC) stick spectrum for benzocorannulene; green: FC spectrum for trans−4-(1-buten-3-yne)corannulene; orange: FC spectrum for cis−4-(3-buten-1-yne)corannulene; magenta: calculated ionization energies of 8.152, 8.184, and 8.453 eV corresponding to the 22A′′, 12A′, and 32A′′ electronic excited states of the benzocorannulene cation.