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I believe it's named $\omega_1$ (correct me if I'm wrong) equal to $\gamma B_1/2$. The fact that it's equal to $\gamma B_1/2$ allows me to see how it works mathematically after a quick calculation, but what actually is the physical meaning of the Rabi Frequency $\omega_1$ for an RF field applied to an NMR setup? And how does it differ from the RF frequency $\omega_{rf}$?

The broader context I'm working with here is quantum control on an NMR system, unfortunately I don't know the actual physics of this very well, I've just been working with the theoretical stuff such as mapping the dynamics of these kinds of systems on to a Bloch sphere.

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The frequency of the applied rf field $\omega_{rf}$ is normally equal to the Larmor frequency at which the spin precesses in the static magnetic field, and its direction is perpendicular to the static field. Consider a frame rotating about the static field at the Larmor frequency. The frequency $\gamma B_1/2$ is the rate at which the spin expectation value rotates about a direction perpendicular to the static field when the rf magnetic field with amplitude $B_1$ is applied.

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