Lecture 22 Spin-orbit coupling.
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(c) So Hirata, Department of Chemistry, University of Illinois at Urbana-Champaign. This material has been developed and made available online by work supported jointly by University of Illinois, the National Science Foundation under Grant CHE-1118616 (CAREER), and the Camille & Henry Dreyfus Foundation, Inc. through the Camille Dreyfus Teacher-Scholar program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the sponsoring agencies.
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Separable because z operator does not act on spin part.
This is zero when final and initial states have different spin eigenfunctions, e.g., singlet and triplet.
Fluorescence is an emission of light between the same spin states (e.g., singlet to singlet). Since this is an allowed transition, it is intense and fast.
Phosphorescence is between different spin states and mediated by SO. It is “forbidden” and it is weak and slow.
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