Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. Engl. 2/1984)
The cover shows the absorption bands (top) of a dye doped in minute con-centrations into an organic glass or polymers. The bands contain “holes” indented using a laser. The scheme at the bottom serves to illustrate the principle of photochemical hole burning. Further details are reprted by D. Haarer and J. Freidrich in their review article on page 96 ff.