Encoding chemical shift with Rabi modulated continuous wave excitation

The response of a spin system to Rabi modulated continuous wave excitation has recently been shown to achieve a substantial steady-state magnetization that exhibits periodic orbits. We exploit this steady-state behavior and explore off resonance effects, in two proof-of-concept experiments and corresponding simulations of the Bloch equation. Our experiments confirm that harmonics of the periodic steady-state magnetization orbits are affected by off-resonance effects and therefore contain chemical shift information, in agreement with predictions. We furthermore demonstrate that chemical shift information can be encoded in a series of CW excitations and used to reconstruct a simple spectrum.

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