| 1. |
- Koptioug, Andrei, 1956-, et al.
(author)
-
Effect of External Magnetic Fields and Resonance Radio frequency Radiation on Radical Reactions
- 1990
-
In: Physica. B, Condensed matter. - : Esevier. - 0921-4526 .- 1873-2135. ; 164:1-2, s. 200-204
-
Journal article (peer-reviewed)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.
|
|
| 2. |
- Koptioug, Andrei, 1956-, et al.
(author)
-
Quantum beats in singlet-triplet transitions of radical pairs induced by a radio-frequency field
- 1990
-
In: Chemical Physics Letters. - Amsterdam : Elsevier Science. - 0009-2614 .- 1873-4448. ; 165:2-3, s. 142-145
-
Journal article (peer-reviewed)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
|
|
| 3. |
- Koptyug, Andrey, 1956-, et al.
(author)
-
Spin-locking in concentration-narrowed OD ESR spectra
- 1989
-
In: Chemical Physics. - Amsterdam : Elsevier. - 0301-0104 .- 1873-4421. ; 138:1, s. 173-178
-
Journal article (peer-reviewed)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.
|
|
| 4. |
- Morozov, V. A., et al.
(author)
-
Dynamic theory of optically detected electron-nuclear double resonance of radical pairs (OD ENDOR) in liquid solutions
- 1992
-
In: Chemical Physics. - Amsterdam : Elsevier. - 0301-0104 .- 1873-4421. ; 165:2-3, s. 297-312
-
Journal article (peer-reviewed)abstract
- The theory of optically detected ENDOR of radical pairs (RP) recombining in liquid solutions is developed without taking account of the processes of relaxation. The RP spin dynamics is analysed in detail under the conditions of resonant two-frequency pumping of electron and nuclear spins in the particular case of the RP with one and two magnetic equivalent nuclei. Theoretical comparison of the OD ENDOR technique and the OD NMR one shows the advantage of the former method in studying longlived RP
|
|
