Fig. 4.

1D GMO-TEDOR pulse sequence used for finding the offset and RF power response of GA-optimized phase modulation set. We studied the offset and RF power response for XX8, XY8, GA8x4 and GA10 phase modulations by using these phase values at φ_{1 to 4}. The responses were measured by varying the offset and RF power of the recoupling π sequences on the ¹⁵N channel. A weak proton field of strength ω_rf = ω_r during the z-filters facilitates rapid dephasing of ¹³C spin coherences. The narrow and wide filled rectangles represent π=2 and π pulses respectively. The adopted phase cycles are: θ₁ = 1111, θ₂ = 2222, θ₃ = θ₆ = 1111, θ₄ = θ₇ = 1111, θ₅ = 1111, θ₈ = 2244, θ₉ = 1111, θ_rec = 4224.