Spin Hamiltonian parameters determined from numerical simulation of the experimental EPR spectra.

Uncertainty in g estimated ±0.0001.a ⟨g⟩ = (g|| + 2g⊥)/3.b Lorentzian residual linewidth (×10–4cm–1).cσ = width of gaussian distribution of g values (“g strain”).d This broad spectrum could also be simulated using an isotropic g factor of 2.0047 and a phenomenological isotropic linewidth of ≈80% Gaussian and 20% lorentzian character.e Solution spectrum of brew prepared from 12 min-roasted beans.Spin Hamiltonian parameters determined from numerical simulation of the experimental EPR spectra.