Manifestation of quantum coherence upon recombination of radical ion pairs in weak magnetic fields. Systems with non-equivalent nuclei

• Published in: Chemical physics letters Vol. 233; no. 4; pp. 444 - 450
• Main Authors: Stass, D.V., Lukzen, N.N., Tadjikov, B.M., Molin, Yu.N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 17.02.1995
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/0009-2614(94)01489-I

Magnetosensitive radiofluorescence has been used to study the magnetic field effect at weak magnetic fields during geminate recombination of singlet radical ion pairs formed radiolytically in non-polar solutions. The existence of the local fluorescence maximum in zero field has been theoretically demonstrated and experimentally verified for radical pairs in which one of the partners contains a great number of non-equivalent magnetic nuclei and the local hyperfine fields of the other partner are negligibly small. In terms of a semiclassical approximation, a simple condition for the appearance of the effect has been obtained: Ωτ ∗ r > 1 , where Ω is the effective ESR spectrum width and T ∗ is the lifetime of a spin-correlated pair.