Fig. 4: Photoionization efficiency (PIE) curves.

PIE curves relevant to the formation of benzocorannulene. a m/z = 300 (C24H12) and b m/z = 301 (13CC23H12). Black: experimentally derived PIE curve; blue: benzocorannulene PIE curve; green: calculated ionization onset of trans−4-(1-buten-3-yne)corannulene; orange: calculated ionization onset of cis−4-(3-buten-1-yne)corannulene. The overall error bars (gray area) consist of two parts: 1 σ error of the PIE curve averaged over the individual scans and ±10% based on the accuracy of the photodiode.