Basic Procedures
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Figure5.5: Examples of Wobble Curves with Different Tuning and Matching
1. Bad matching and tuning. 3. Good matching, bad tuning.
2. Bad matching, good tuning. 4. Good matching and tuning.
If you want to optimize the probe for several nuclei (e.g. decoupling experiments) you can
choose the next nucleus in the ATMM Probe Tuning/Matching Window.
5.5 Spinning the Sample
A second function of pressurized air is to enable the sample to rotate. The spinning of the
sample serves to "even-out" some of the inhomogeneity that may exist in the magnetic field
at the center of the magnet.
Note: Samples to be investigated using experiments such as 2-D, 3-D, SELECTIVE,
NOEDIFF, T1 and all inverse probes are normally not rotated.
Suggested spin rates are:
• 20 Hz for a 5 mm probe
• 12 Hz for a 10 mm probe
• On the Spin button, click the drop-down arrow to see more options.
• In the list, select Turn sample rotation on (ro on).
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