A triplet mechanism for magnetic field modulation of photochemical quantum yields | Zendy

Steiner Ulrich | Zendy

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A triplet mechanism for magnetic field modulation of photochemical quantum yields

Author(s) -

Steiner Ulrich

Publication year - 1981

Publication title -

berichte der bunsengesellschaft für physikalische chemie

Language(s) - English

Resource type - Journals

ISSN - 0005-9021

DOI - 10.1002/bbpc.19810850311

Subject(s) - intersystem crossing , chemistry , magnetic field , triplet state , quantum yield , dissociation (chemistry) , excimer , photochemistry , atom (system on chip) , atomic physics , physics , excited state , fluorescence , singlet state , quantum mechanics , computer science , embedded system

A mechanism is described whereby the influence of an external magnetic field on the sublevels of a triplet exciplex, subject to heavy‐atom‐induced sublevel‐selective deactivation, modulates the radical dissociation yield of the exciplex. A sublevel selection rule for the heavy atom effect on T 1 — S 0 intersystem crossing in the triplex exciplex is derived. The magnetic field influence is treated on the basis of an approximate solution of a stochastic Liouville equation, leading to a simple analytic expression for the magnetic field effect on the radical yield. The result is applied to explain a previously observed magnetic field effect. The mechanism described may induce magnetic field effects on any triplet reaction competing with sublevel‐selective deactivation.

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