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A method is implemented to perform "fast" adiabatic variation of the spinHamiltonian by imposing the constant adiabaticity condition. The method isapplied to improve the performance of singlet-state Nuclear Magnetic Resonance(NMR) experiments, specifically, for efficient generation and readout of thesinglet spin order in coupled spin pairs by applying adiabatically rampedRF-fields. Test experiments have been performed on a specially designedmolecule having two strongly coupled C-13 spins and on selectively isotopicallylabelled glycerol having two pairs of coupled protons. Optimized RF-ramps showimproved performance in comparison, for example, to linear ramps. We expectthat the methods described here are useful, not only for singlet-state NMRexperiments, but also for other experiments in magnetic resonance, whichutilize adiabatic variation of the spin Hamiltonian.

Constant-adiabaticity RF-pulses for generating long-lived singlet spin states in NMR