Selective homonuclear 1D experiments usually start from the selective ¹H excitation of a given resonance followed by a mixing process. When PFGs are available, the SPFGE scheme is highly recommended as a selective excitation scheme. Selective 1D experiments can be easily derived by adding the corresponding mixing process between the SPFGE block and the acquisition period, as shown for the selective ge-1D NOESY:

Easy implementation on AVANCE spectrometers equipped with shaped pulse and gradient capabilities.

For further details about implementation of selective excitation schemes and selective 1D experiments in AVANCE spectrometers see:

• Tutorials on Selective Excitation schemes
• Tutorials on Selective 1D Experiments
• Tutorials on Shaped pulses

The most standard way to implement a selective gradient-enhanced echo building block in a pulse program is:

...  50u UNBLKGRAD p16:gp1 d16 pl0:f1 p12:sp2:f1 ph2 50u p16:gp1 d16 BLKGRAD ...

in which

• p12 is the duration of the shaped refocusing pulse
• sp2 is the power level of the selective pulse
• spnam2 is the shape of the selective pulse
• p16 and gpz1 defines the duration and the strength of the involved gradients, respectively.

See theoretical descriptions of related experiments in the following lists: Selective excitation schemes
Selective homo- and heteronuclear 1D experiments
Selective gradient-based 1D experiments