Figure 30.1. A schematic diagram of the 2D L-COSY sequence containing three slice-selective RF pulses (90∘, 180∘, 90∘) for volume localization. The B0-crusher gradient pulses were played around the 180∘ refocusing and the second 90∘ coherence transfer RF pulses. After the evolution during 2𝜏, there is a formation of the Hahn spin echo. Direct acquisition along t2 and indirect detection along t1 enable encoding of two spectral dimensions
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