Abstract
The results show that it is possible to obtain extremely high-quality mass spectra of these compounds with subfemtomole sensitivity limits. Although the degree of ionization selectivity of atomic species is much lower than for MPRI of molecules, we show that it is possible to control the degree of photofragmentation by varying the laser intensity. Spectra obtained by MPRI, by nonresonant multiphoton ionization (MPI), and directly by secondary ion mass spectrometry (SIMS) are quantitatively compared. Finally, we demonstrate that mixtures of PAC's are readily detected by examining a cocktail of codeposited benzo [a] pyrene, dibenz [ac]-anthracene, triphenylene, and pyrene. In general, we propose that this approach is a powerful new method for detecting low concentrations of complex molecules adsorbed on surfaces
Published Version
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