Single bond, dissociation Singlet

Single-bond dissociation is the simplest when it takes place between atoms that carry no multiple bonds, lone pairs, or empty orbitals. In that case it is bitopic (two active orbitals). If the single bond is covalent and uncharged, the a,o ) state (which often represents S,) is weakly bound and often fluorescent, and the a,o ) state (which often represents T ) is purely dissociative, as shown schematically in Figure 4.5 for the dissociation of H2. Another example is the photodissociation of the Si—Si bond, mentioned in Section 7.2.3. Bitopic photodissociation normally takes place in the triplet state, which correlates with a radical pair, and not in the singlet state, which correlates with an ion pair. 

Single bond, dissociation. 188-90 stretching, 205 Singlet. 13. 180 impure, 28... 

Dissociation Energy, HOMO-LUMO Cap, Triplet-Single Gap, and Bond Length for the Triplet and Singlet States of the Studied Molecules... 

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