10 - NMR Theory 1

10 - NMR Theory 1 - 4 Lab vs. rotating frame of reference...

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1 Practical aspects of NMR data collection Shimming The problem with the magnetic field is that it is not homogeneous over the entire sample. We can correct this by “shimming the magnet” There are two types of “shims” available: cryoshims (set up when the magnet is installed) and room-temperature shims. Typical room temperature shims
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2 Lineshapes and incorrect shims The deuterium lock
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3 Shimming by hand: maximize the integrated lock signal (you can shim on a resonance) Vector model • A way to visualize magnetization vectors • Only useful for single (observable) quantum. • Not good for multiple quantum experiments
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Unformatted text preview: 4 Lab vs. rotating frame of reference What it looks like to the observer 5 90 and 180 degree pulses What the signal looks like and your left hand tells you where it goes 6 Two signals On-resonance multiplets 7 What we collect (digitize) is data in the rotating frame Correcting your phase 8 How to tell if you are not phased (and what to do about it) What is the 90 degree pulse and how do I determine it? Effective bandwidth: B1 = 1/PW360 = 1/4*PW90 Hz 9 Getting to that value: The block diagram of a modern spectrometer...
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10 - NMR Theory 1 - 4 Lab vs. rotating frame of reference...

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