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Chemical Physics Letters

Temperature dependent hole-burning study of dye molecules absorbed on metal oxide powders

Th. Basché, Christoph Bräuchle

Published Jun 1, 1991• 20 citations
Publisher
DOI
10.1016/0009-2614(91)90352-a

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In this talk we review our recent results on dye-surface systems investigated by persistent spectral hole-burning. Dye-surface systems are an interesting class of hole-burning materials. In most dye-surface systems investigated by us stable holes can be burnt and detected at unusual high temperatures [1,2,3]. In addition, the understanding of the interaction between adsorbed molecules and the heterogeneous surface may provide new insights in processes important in catalysis.

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First preliminary persistent spectral hole-burning (PSHB) investigations of dye-molecules adsorbed onto the disordered surfaces of metal oxide powders or porous glasses1,2,3 indicated that these systems seem to behave quite similar to doped glasses. The optical absorption is strongly inhomogeneously broadened due to the disorder of the surface and at 1.5 K holewidths in the 1 cm1 range - even an order of magnitude broader than in glasses - have been reported. In the following we will give a short summary of our latest more detailed investigations of surface adsorbed dye-molecules which on the one hand reaffirm that these systems indeed behave in many respects as 3-D disordered systems but on the other hand point to some remarkable specific features of adsorbed dye-molecules.