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Old 2006-02-16, 10:28
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fatdanny fatdanny is offline
Join Date: Jun 2004
Location: Scotland
Posts: 1,061
This week, I have been mostly learning about Multinuclear NMR (nuclear magnetic resonance) spectroscopy.

In solids, shielding anisotropy, dipolar interactions and quadrupolar interactions broaden the peaks in the spectrum - fucking it up.

However, all these interactions are dependent on cos^2(theta) - 1, so spinning your sample at 54.74 degrees (the magic angle) to the applied magnetic field reduces this term to zero, giving a readable spectrum with sharp peaks.

There you have it - Magic angle spectroscopy - I think it's pretty nifty.
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