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94 GHz pulsed derivative EPR spectra of NH2Y730• in H2O (black trace) and D2O (red trace). Experimental parameters: echo sequence: π/2 = 32 ns, τ = 248 ns (in H2O), τ = 260 ns (in D2O), π = 64 ns; trep = 5 ms; shots/point = 50; scans = 700; T = 70 K. The ticks on the deuterated trace indicate the positions of the quartet. See text for details.
