Abstract
Neutral molecules ejected by matrix-assisted laser desorption were detected by photoionization with coherent vacuum-ultraviolet radiation. The photoionization mass spectra of laser-desorbed neutrals were compared to temperature- and wavelength-dependent photoionization mass spectra of vapor-phase molecules. Mass spectra were obtained for primary and secondary alkylamines desorbed from various matrices. Ionic fragmentation in the photoionization mass spectra showed that alkylamine neutrals ejected by matrix-assisted laser desorption contained between 0.6 and 0.9 eV of internal energy even with desorption irradiances near threshold. These internal energies corresponded to «temperatures» between 440 and 520 K. The temperatures were comparable to the sublimation temperatures of the matrices used
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