๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Photochemical processes on aluminium oxide. A pulsed laser study of photoinduced reactions

โœ Scribed by G. Beck; J.K. Thomas

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
482 KB
Volume
94
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The photochemistry of pyrene and naphthalene adsorbed on A1203 has been studied by pulsed laser techniques. Osy-Zen quenches the fluorescence of both molecules very efficiently while the triplet state of pyrene is quenched much more slowly (X l/100). Nitrobenzene and diiethylaniline also quench pyrene fluorescence_ Photolysis at hi& laser power photoionises pyrene, and the back reaction observed throu& the pyrene cation follows tunnel& kinetics. Co-adsorption of long chain alcohols on Al203 leads to a decrease in the fluorescence quenching rates v&h both 02 and nitrobenzene.

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The laser-induced photopotential was measured on n-ZnO and n-Ti02 polycrystalbne electrodes with and without a "current doubling reagent" HCOONa. The rise time of the photopotential was 5-10 ns. The origin of the photopotential, the kinetics and the mechanism of the current doubling process are disc