Figure 5.

Refocused echo with all rectangular pulses (a) and chirp refocusing pulses (b). Refocused echoes as measured on the 3.4nm Gd³+ ruler molecule using pulse sequence in (a) blue trace and pulse sequence in (b) red trace (c). Experimental Parameters: temperature 10 K; frequency 192.51 GHz; π/2 = 187.5 ns; π = 375 ns; π_chirp = 1 μs; Δω_chirp = 4MHz; τ = 1 μs; t = 6 μs; t_p = 1 μs; repetition time 100 μs;