Abstract
The conditions necessary to obtain multiple adiabatic population inversion at different frequencies in a two-level system are defined. It is shown how any pulse that produces adiabatic inversion in a single frequency band can be modified to become a multiband adiabatic inversion pulse. Using Floquet formalism, the interaction between the different inversion bands is described and shown to create effective nonlinear irradiation fields. By controlling the reference phase of the single-inversion-frequency-band pulses, these effective irradiation fields can be minimized or canceled. These pulses can be used for multiple selective excitation or selective population inversion in coherent spectroscopy. NMR experiments confirming the theoretical predications are shown. The experimental results agree very well with the theoretical predictions.
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