Manifestation of g-tensor anisotropy in the quantum beats of spin-correlated radical ion pairs

• Published in: Chemical physics letters Vol. 712; pp. 208 - 213
• Main Authors: Borovkov, V.I., Bagryansky, V.A., Letyagin, G.A., Beregovaya, I.V., Shchegoleva, L.N., Molin, Y.N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 16.11.2018
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2018.10.004

[Display omitted] •Radiation-induced fluorescence from frozen tricosane doped with a luminophore was studied.•Magnetic field effect in the fluorescence showed Δg-quantum beats on a nanosecond timescale.•The frequency of the beats increased upon going from the liquid to the crystal phase.•Effect of the g-tensor and hyperfine coupling anisotropy was analysed.•Fast hole migration in the tricosane crystal favoured observation of the beats. The effect of an external magnetic field on the radiation-induced fluorescence of tricosane (n-C23H48), doped with luminophore, was studied on the nanosecond timescale. It was found that the characteristic frequency of quantum beats caused by the difference between the Zeeman interactions of dopant radical anions and tricosane radical cations increased substantially upon transition from the liquid to the crystal phase. Experimental data were in agreement with both the quantum-chemical calculations and theoretical spin evolution simulations, assuming that hyperfine couplings and transverse components of the tricosane radical cation g-tensor were averaged out by degenerate positive charge transfer in the tricosane crystal.