Inhomogeneous contribution to the width of zero-field MARY line

Abstract

The paper discusses the dependence of the singlet product yield in the recombination of radical ion pairs vs. external magnetic field in a situation when hyperfine couplings in one partner are much greater than those in the other partner. The theoretical calculations performed for the case of equivalent magnetic nuclei demonstrate a considerable effect of small hyperfine couplings on the shape of this dependence. In particular, the width of the low-field magnetic field effect (referred to as the ‘zero-field’ MARY line) is determined by weak hyperfine interactions along with spin coherence lifetime. The predictions are in a qualitative agreement with experimental results.

Keywords:

• MARY
• radical ion pairs
• magnetic field effect
• spin chemistry
• zero-field line

Acknowledgements

The authors are grateful to Dr N.N. Lukzen and Dr D.V. Stass for fruitful discussions in the course of this work.

Additional information

Funding

The work was supported by the Council for Grants of the President of the Russian Federation for State Support of Leading Scientific Schools [grant number Sh-5744.2014.3].