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a Trajectory of magnetization during an ideal AFP pulse, fulfilling the adiabaticity condition. The time dependence of the effective magnetic field is shown in red. The magnetization vector (blue) follows it and perfect inversion occurs. b Path of magnetization in case where the adiabaticity condition is not fulfilled. The magnetization vectors oscillates around the effective field, and the pulse does not lead to inversion. Attenuation due to relaxation has been neglected
