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The combhation of thin-layer chromatography (TLC) and laser mass spectrometry (LMS) Is establlshed as a potentlally powerful analytical t a l q u e . LMS Is used to detect the separated compomb directly from the polyamkle TLC plate.One can analyze dkectly from polyamide because it does not alter compound Identiffcatlon, and polyamtde does not interfere with the mass spectrum owing to its low mass fragment ions (

Laser time-of-flight mass spectra of polycyclic aromatic hydrocarbons showing positive ion, even-numbered carbon clusters to €554 are reported. Negative ion spectra show clusters through Cjoo-Four different "clustering regions" are observed, depending upon laser focus conditions. Laser irradiance plays a key role. Greatly enhanced abundance of C80 reported by others using graphite and other sources of carbon is not observed.