Ionization of a 4,4′-bis(phenylethynyl)anthracene (C30H18, BPEA) molecule is studied for the first time at different energies of bombarding electrons in crossed electron and molecular beams. The relative cross-section of single ionization of a BPEA molecule in the energy range of 5–55 eV is measured. The ionization potential, Ei = 7.62 ± 0.2 eV, is determined using the threshold region of C30H18+ ion yield energy dependence. A scheme of the BPEA molecule fragmentation is proposed. Experimental results are in reasonable accordance with calculations made in the framework of the density functional theory.
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