Figure 3.

(a) Mildly unresolved solid effect enhancement profile for protons in 4 M [U–¹³C,¹⁵N] urea with 40 mM of the Finland trityl radical (black). This figure was reproduced with modification with permission from the Journal of Magnetic Resonance.⁵³ Superimposed is the center frequency dependence of eDEC to demonstrate the location of the EPR spectrum of the radical (green). This figure was reproduced with modification with permission from the Journal of the American Chemical Society.⁴⁵ (b) Possible frequency-swept ISE/off-resonance NOVEL pulse sequence. (c) eNCP. Color gradients in Figure 3b,c indicate frequency-chirped microwaves. (d) Proposed electron-detected multiple-dimensional pulse sequence.