Abstract
Mass spectra are obtained for 27 organic molecules following irradiation with focussed 193-nm (6.42-eV) photons from an ArF excimer laser. The molecules chosen represent several classes of organic compound. Comparisons between the multiphoton-ionization mass spectra and low-energy electron-impact mass spectra indicate that the dominant ionization pathway is non-resonant two-photon absorption. Data for benzaldehyde and CS 2 provide clear exceptions to this mechanism. These two molecules exhibit enhanced fragmentation owing to the presence of one-photon resonances.
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