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Average steady-state nuclear spin polarization (npol,av, solid symbols) and time constant (tDNP,av, open symbols) as a function of microwave frequency (ωm/2π) for (a) a Totapol biradical20 and (b) a hypothetical narrow-line biradical, composed of two radicals with different g-factors (both with 30 MHz axially symmetric g-anisotropy), so that the ESR frequencies are separated by ωn. Lines are drawn to guide the eye.
