A new approach is presented, that enables on‐line detection of large polycyclic aromatic hydrocarbons (PAH) and fullerenes in premixed flat low‐pressure flames by molecular beam resonance‐enhanced multiphoton ionization mass spectrometry (REMPI‐MS). A multi‐pass mirror system for the laser beam was developed to increase the amount of ions formed. In benzene/oxygen flames, PAH with molecular masses up to more than 103 u were observed. For the first time, this method has also provided on‐line mass spectra of electrically neutral flame‐generated fullerenes (C32 to about C300) after the investigation of fullerene flame ions. The fragmentation induced by laser irradiation is discussed.
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Ahrens et al. (1994) studied this question.
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