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Jet-cooled exciplexes: Cyanoanthracene with 2,5-dimethyl-2,4-hexadiene

✍ Scribed by Oded Anner; Esmael Zatura; Yehuda Haas

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
397 KB
Volume
137
Category
Article
ISSN
0009-2614

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✦ Synopsis

Fluorescence excitation spectroscopy of a cyanoanthracene (CNA) seeded in helium and expanded in a supersonic jet in the presence of 2,5-dimethyl-2,4-hexadiene (DMHD), reveals two types of transitions. One consists of narrow bands in both excitation and emission, characteristic of van der Waals complexes. The other involves broad bands ( GZ 200 cm-' in excitation, and about 2500 cm-' in emission), assigned to an exciplex. It is found that the decay time of the exciplex emission decreases steeply with excess energy, indicating an efficient radiationless process.

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