Time evolution of spin state of radical ion pair in microwave field: An analytical solution

Details Time evolution of spin state of radical ion pair in microwave field: An analytical solution Time evolution of spin state of radical ion pair in microwave field: An analytical solution

2006-02-02

arxiv.org/abs/physics/0602016v1

Physics

Chemical Physics

18 pages, 7 figures

Scientific paper

10.1088/0953-4075/39/9/010

The paper reports an exact solution for the problem of spin evolution of radical ion pair in static magnetic and resonant microwave field taking into account Zeeman and hyperfine interactions and spin relaxation. The values of parameters that provide one of the four possible types of solution are analysed. It is demonstrated that in the absence of spin relaxation, besides the zero field invariant an invariant at large amplitudes of the resonant microwave field can be found. The two invariants open the possibility for simple calculation of microwave pulses to control quantum state of the radical pair. The effect of relaxation on the invariants is analysed and it is shown that changes in the high field invariant are induced by phase relaxation.

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