This is a simple variant of the classical DEPT-45 experiment in where the last hard 180 degree ¹³C pulse has been replaced by an adiabatic 180 degree pulse for a improved broadband inversion.

The experiment is easily recorded from the standard DEPT-45 parameter set by changing the pulse program to deptsp45.

The parameters defining the adiabatic pulse are:

p12 is the duration (needs calibration)

sp2 is the power level (needs calibration)

spnam2 is the shape, usually Crp60comp.4

Data are acquired and processed in the usual way.