Quantum beats in the recombination fluorescence of radical ion pairs caused by the hyperfine coupling in radical anions

The ratios of the radiofluorescence decay curves for n-decane solutions of 1,2,3,4-tetraphenylcyclopenta-1,3-diene and its silicon and germanium analogs (siloles and germoles) in high and zero magnetic fields have an oscillating component caused by singlet–triplet evolution of the pair S +/A −, wher...

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Bibliographic Details
Published in:Chemical physics letters 1998-10, Vol.295 (3), p.230-236
Main Authors: Bagryansky, V.A, Borovkov, V.I, Molin, Yu.N, Egorov, M.P, Nefedov, O.M
Format: Article
Language:English
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Summary:The ratios of the radiofluorescence decay curves for n-decane solutions of 1,2,3,4-tetraphenylcyclopenta-1,3-diene and its silicon and germanium analogs (siloles and germoles) in high and zero magnetic fields have an oscillating component caused by singlet–triplet evolution of the pair S +/A −, where S + is the solvent hole and A − is the radical anion of the acceptor (a compound added). It is shown that the beats are due to the hyperfine couplings (hfc) with either the protons of CH 2, SiH 2 and GeH 2 moieties or chlorine atoms in the GeCl 2 and GeClMe moieties of radical anions. The hfc constants in the anions and spin relaxation times of radical ion pairs were obtained by fitting the experimental curves.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(98)00956-7