| 1. |
- Koptioug, Andrei, 1956-, et al.
(författare)
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Effect of External Magnetic Fields and Resonance Radio frequency Radiation on Radical Reactions
- 1990
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Ingår i: Physica. B, Condensed matter. - : Esevier. - 0921-4526 .- 1873-2135. ; 164:1-2, s. 200-204
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Tidskriftsartikel (refereegranskat)abstract
- It is well known that an external magnetic field can affect the rate of singlet-triplet transitions in a radical pair and hence its recombination probability in liquid. Resonance radiofrequency (RF) radiation induces quantum beats in the kinetics of radical pair recombination. At high RF field amplitudes the singlet-triplet transitions in radical pairs can be efficiently suppressed.
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| 2. |
- Koptioug, Andrei, 1956-, et al.
(författare)
-
Quantum beats in singlet-triplet transitions of radical pairs induced by a radio-frequency field
- 1990
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Ingår i: Chemical Physics Letters. - Amsterdam : Elsevier Science. - 0009-2614 .- 1873-4448. ; 165:2-3, s. 142-145
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Tidskriftsartikel (refereegranskat)abstract
- This Letter reports on the experimental observation of quantum beats stimulated by a resonance radio-frequency field in the recombination luminescence of radical-ion pairs. The beat frequency for solutions of p-terphenyl in squalane increases linearly with rf-field amplitude in the range 1 to 10 G in a rotating frame. The beat frequency corresponds to the theoretically calculated one, with amplitude twice as low as the theoretical one. This is attributed to contributions from the recombination of spin-uncorrelated radical-ion pairs
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| 3. |
- Koptyug, Andrey, 1956-, et al.
(författare)
-
Spin-locking in concentration-narrowed OD ESR spectra
- 1989
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Ingår i: Chemical Physics. - Amsterdam : Elsevier. - 0301-0104 .- 1873-4421. ; 138:1, s. 173-178
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Tidskriftsartikel (refereegranskat)abstract
- The effect of spin- locking under the action of a resonance rf field of large amplitude has been observed in the optically detected ESR spectra (OD ESR) of radical-ion pairs both in strong and weak magnetic fields. "Hampering" of singlet-tgriplet transitions occurs for concentrations of aromatic acceptors in non polar solutions at room temperature from 10e-4 to 1 M. It is proposed that in spite of strong concentration narrowing OD ESR signals are inhomogeneously broadened. This can be due to neutral molecule- radical-anion aggregate formation.
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