Figure 3.

Effects of spin-selective scavenging reactions on a model radical pair. Comparison of the singlet fraction ($\mathrm{Tr}[{\hat{P}}_{\mathrm{AB}}^{\mathrm{S}}\hat{\rho }\left(t\right)]$, red lines), the triplet fraction ($\mathrm{Tr}\left[\hat{\rho }\left(t\right)\right]-\mathrm{Tr}[{\hat{P}}_{\mathrm{AB}}^{\mathrm{S}}\hat{\rho }\left(t\right)]$, blue lines) and the survival probability (s(t), dashed black lines) of a radical pair AB reacting with (a) a diamagnetic scavenger (J = 0) and (b) a radical scavenger (J = ½). (c) Survival probability, s(t), and (d) singlet probability of the survivors, $p_{\mathrm{AB}}^{\mathrm{S}}\left(t\right)$, for a radical pair reacting with scavengers with different spin quantum numbers, J. The reaction product has spin quantum number S = J − ½ (i.e. $k_{\mathrm{C}}^{+}=0$ and $k_{\mathrm{C}}^{-}=k_{\mathrm{C}}$). Additional reaction pathways, coherent spin evolution processes and spin relaxation have all been omitted.