90° RF pulse | FID

If after the RF pulse, the number of protons on the higher energy level equals the number of protons on the lower energy level, longitudinal magnetization has disappeared, and there is only transversal magnetization due to phase coherence. The magnetic vector seems to have been "tilted" 90° to the side. The corresponding RF pulse is thus also called a 90° pulse.
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That's so clear, I can go to bed now.