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. Author manuscript; available in PMC: 2019 Sep 15.
Published in final edited form as: Methods. 2018 Apr 24;148:123–135. doi: 10.1016/j.ymeth.2018.04.015

Figure 3.

Figure 3

Schematic pulse sequences. (A) 1D Single pulse excitation (SPE) with 1H decoupling (DEC) during acquisition, which is shown as a free-induction decay (FID), (B) 1D Cross-Polarization (CP), with the CP contact time τCP indicated. (C) 1D refocused INEPT, with the τ1 and τ2 delay times indicated. (D) 2D CP/DARR pulse sequence for dipolar-coupling-based 13C-13C correlations. (E) 2D INEPT/TOBSY pulse sequence for scalar-based 13C-13C correlations. (F) 1D 1H T2-filtered CP-based pulse sequence used for e.g. water-filtered spectroscopy. (G) CP/DIPSHIFT experiment that correlates chemical shift and heteronuclear dipolar interaction, and can be used to measure dipolar order parameters. In all panels, filled rectangles represent 90° pulses and all empty rectangles are 180° pulses, while I and S labels represent abundant (1H) and rare (13C, 15N) nuclei respectively. Colored brackets below/above indicate the signal preparation (blue), magnetization transfer (green) and dephasing (red) pulse sequence building blocks, as defined in the inset (top right) and Fig. 2.