Abstract
The photochemistry of pyrene and naphthalene adsorbed on Al 2O 3 has been studied by pulsed laser techniques. Oxygen quenches the fluorescence of both molecules very efficiently while the triplet state of pyrene is quenched much more slowly (× 1/100). Nitrobenzene and dimethylaniline also quench pyrene fluorescence. Photolysis at high laser power photoionises pyrene, and the back reaction observed through the pyrene cation follows tunnelling kinetics. Co-adsorption of long chain alcohols on Al 2O 3 leads to a decrease in the fluorescence quenching rates with both O 2 and nitrobenzene.
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