Question

What is phase cycling and why is it used in NMR spectroscopy?

Answer 1

Phase cycling is a way to choose the proper coherence pathway in order to acquire the NMR signal which has the interactions you are trying to acquire.

In NMR simply throwing a string of pulses with random phases is a recipe for disaster.

Two problems are commonly encountered during detection of the NMR signal.

1. first occurs when the detector should be detecting zero but actually records a non-zero value. This is known as a receiver baseline error, commonly known as a zero glitch.
2. The other type of artifact occurs from errors in the quadrature detection of the NMR signal. NMR spectra can contain both of these and can severely complicate spectra. we can eliminate these by employing phase cycling.

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