Comparison of the double-photoionization processes in triphenylene and corannulene with coronene

We have studied the production of doubly charged molecular ions by a single photon for the aromatic molecules triphenylene (C18H12) and corannulene (C20H10) using monochromatized synchrotron radiation from 18 eV to 270 eV. We compare our results with previously published data for partially deuterated benzene (C6H3D3), pyrene (C16H10), and coronene (C24H12). The question that we address in this paper is how the different but similar molecular structures of coronene, corannulene, and triphenylene affect the photon-energy dependence of the ratio of doubly to singly charged parent ions. A theoretical analysis of the main features in terms of independent molecular subsystems will be discussed.

Automated summary

This study examined the production of doubly charged molecular ions by a single photon for various aromatic molecules and discussed how the different molecular structures affected the photon-energy dependence of the ratio of doubly to singly charged parent ions. The results showed that the structures of the aromatic molecules did have an impact on the ratio of doubly to singly charged ions.