Abstract
The cis-trans isomerization in photo-excited polyenes represents a fundamental type of photoreaction which, despite of considerable experimental and theoretical efforts, is still not very well understood in many aspects [1]. Structureless absorption bands and the absence of detectable fluorescence have hampered standard spectroscopic investigations, so that even for the smallest systems as ethylene and butadiene the relaxation pathways (i.e. the involved electronic states and nuclear degrees of freedom) and corresponding timescales are not yet clear.
© 1994 Optical Society of America
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