Preferred Label : El-Sayed rules;
IUPAC definition : The rate of intersystem crossing is relatively large if the radiationless transition
involves a change of orbital type.;
Scope note : a typical case is the transition from the lowest singlet state to the triplet manifold,
e.g., 1p,p* ¿ 3n, p* is faster than 1p, p* ¿ 3p, p* and 1n, p* ¿ 3p, p* is faster
than 1n, p* ¿ 3n, p*.;
Origin ID : ET07369;
See also
The rate of intersystem crossing is relatively large if the radiationless transition
involves a change of orbital type.
