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Pulse Sequences

HPDEC

High powered decoupling (hpdec) is applied to remove the complicating effects of heteronuclear coupling. The most common source of dipolar coupling is from 1H spins to the spins of the nuclei being observed. The application of high power irradiation at the frequency of the 1H resonance causes those spins to undergo repeated transitions at a rate determined by the amplitude of the irradiation. If the rate is rapid enough the desired nuclei can be observed without the broadening effects of dipolar coupling.