Orientation of excited state

Many other molecules, such as SO2 [880], NO2 [881], or CS2 [882], have been investigated. A fine example of the capabilities of molecular quantum-beat spectroscopy is the determination of the magnitude and orientation of excited-state electric dipole moments in the vibrationless Si state of planar propynal [883]. 

Fuchs, H., J. Zimmerman, and B. Roder (2003). Experimental determination of the orientation of excited state transition dipoles in tetrapyrroles with different molecular symmetries. Opt. Commun. 220(1-3), 119-127 and references cited. 

The streochemistry of addition is controlled by orientation, of excited state complex. The electron deficient alkenes give mixture of exo- and endo- adducts in non-concerted process. 

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See also in sourсe #XX -- [ ]

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