Quantum Beats in the Singlet Probability

Unfortunately, explicitly treating all the hyperflne interactions is not possible due to the increasing dimensionality of the basis set. Instead within the semiclassical approximation [10, 11] an effective hyperflne constant was calculated (Eq- 8.23) which allows the modelling of the chemical system to be tractable. 

S is given the characteristic properties of HFB. It is assumed the unpaired electron in cyclohexane radical cation couples to the six equivalent equatorial protons with the six axial protons not interacting to any significant extent. Abbreviation used HFC (hyperfine coupUng constant) 

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