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VOLUME 38 (1983) | ISSUE 4 | PAGE 185
Laser photoionization detection of submonomolecular surface films
A new method has been developed for detecting ultrasmall numbers of molecules adsorbed on a surface (10~8-10~10 of a monolayer). The method involves a pulsed laser desorption of the adsorbed molecules, a subsequent resonant stepwise photoionization of these molecules above the surface by a UV laser beam, and the detection of the ions in a spectrometer. The method has been used to study anthracene and napthalene adsorbed on graphite.