Multiband Adiabatic Inversion Pulses |
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| Institution: | 1. Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada;2. Medicine, University of British Columbia, 2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada;3. Radiology, University of British Columbia, 2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada;1. Istituto Nazionale di Fisica Nucleare (INFN), Pisa, Italy;2. GE Global Research, Munich, Germany;3. Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy;4. IRCCS Stella Maris Foundation, Pisa, Italy;5. IMAGO7 Foundation, Pisa, Italy |
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| 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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