NMR broadband decoupling with low radiofrequency power

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For high resolution NMR spectroscopy of carbon- 13, it is important to be able to achieve broadband proton decoupling with the minimum dissipation of radiofre- quency power in the probe. Otherwise undesirable heating effects can occur, and the resulting l convection may degrade resolving power and sensitivity. Radiofrequency power dissipation is proportional to d(B2)2 where B2 is the radiofrequency intensity and d is the duty cycle of the irradiation. It is convenient to define a figure of merit Z for decoupling performance (I) E = 2AB,,,d(B2d1’2)