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. Author manuscript; available in PMC: 2012 Jun 8.
Published in final edited form as: J Am Chem Soc. 2011 May 13;133(22):8673–8680. doi: 10.1021/ja201880y

Figure 6.

Figure 6

89Y (left axis) versus 13C (bottom axis) polarization plotted with spin temperature Ts as the implicit parameter. The data points were taken from Figure 5. The mirror axes correspond to the 89Y and 13C NMR signal enhancement at 9.4 T and 298 K. The solid line is the thermal mixing prediction (Equation 6) where both nuclear spin species acquire the same Ts in the solid-state under microwave irradiation and the dashed line is from the fit P(89Y) = (89γn/13γn)P(13C). Inset: Thermal mixing model where the 89Y and 13C nuclear Zeeman reservoirs are in thermal contact with the electron spin-spin interaction reservoir which is dynamically cooled by microwave irradiation.