He * (2 3 S) Penning ionization electron spectra (PIES) of chrysene (C 18 H 12 ), perylene (C 20 H 12 ), and coronene (C 24 H 12 ) in the solid state were studied. Collision energy dependence of partial ionization cross-sections (CEDPICS) of solid state samples was measured for the first time. The CEDPICS of those samples shows positive and negative slopes depending on the final ionic states. As common features, negative CEDPICS for π bands and positive CEDPICS for ρ bands were observed. This indicates that the interactions between He * (2 3 S) and those aromatic hydrocarbons are attractive in the region where π orbitals extend and are repulsive around the hydrogen atoms.