2D HSQC
From NMR Wiki
2D HSQC (Heteronuclear Single Quantum Coherence) experiment correlates chemical shifts of directly bound nuclei (i.e. two types of chemical nuclei). For example 1H,15N-HSQC correlates chemical shifts within NH groups.
1H,15N-HSQC and 1H,13C-HSQC are frequently used for liquid-state protein NMR spectroscopy.
Chemical shift of one nucleus - usually 1H is detected in the directly measured dimension, while chemical shift of second nucleus (heteronucleus or X-nucleus) is recorded in the indirect dimension.
Implementations
13C HSQC decoupler2 (Rutgers Univ.)
15N-HSQC, with 13C decoupling and SE 500 MHz Inova (G. Montelione, Rutgers Univ.)
13C-HSQC, 15N decoupling, SE, 500 MHz Inova (G. Montelione, Rutgers Univ.)