Fig. 3: Photoionization mass spectra.

Comparison of mass spectra taken at a photon energy of 9.00 eV. a Bromocorannulene (C20H9Br) – helium (He) system; b bromocorannulene (C20H9Br) – vinylacetylene (C4H4) system at a reactor temperature of 1200 ± 100 K. The mass peaks of the newly formed C24H12 (m/z = 300) species along with the 13C-substituted counterparts (m/z = 301) are highlighted in red.