Determination of polycyclic aromatic hydrocarbons using gas chromatography/laser ionization mass spectrometry with picosecond and nanosecond light pulses

The effect of laser pulse duration on the ionization efficiency of a variety of polycyclic aromatic hydrocarbons is studied by use of laser ionization gas chromatography/mass spectrometry. For compounds that undergo rapid excited-state relaxation, the use of ultrashort (picosecond) light pulses increases the probability of ionization relative to relaxation, resulting in improved ionization efficiency for these species.

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