Fig. 4. (a) Pulsed EPR Hahn echo decay traces for 1sol1 mM at different temperatures recorded at 343 mT. In the inset the employed pulse sequence. (b) Rabi oscillations for 1sol1 mM recorded at 4.3 K at 10 dB microwave attenuation. The change in oscillations observed at tp > 400 ns is due to the interaction between the electron spin and surrounding protons.48 In the inset the Rabi frequency (ΩR) vs. oscillating field intensity superimposed to the linear best-fit.
