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Chemistry · Glossary

What is Free induction decay?

Definition 8.9 University Chemistry — Year 3 · Chapter 8 — NMR in Depth: Pulses, Relaxation and 2D

After a $90^\circ$ pulse, the transverse magnetisation precesses at the Larmor frequency and induces an oscillating voltage in the coil around the sample, which dies away as the magnetisation relaxes: the free induction decay (FID).

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