" /> El-Sayed rules - CISMeF





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*.;

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The rate of intersystem crossing is relatively large if the radiationless transition involves a change of orbital type.

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29/07/2025


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