NMR: Difference between revisions
From Pumping Station One
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== Terminology == | == Terminology == | ||
* NMR - Nuclear magnetic resonance | * NMR - Nuclear magnetic resonance | ||
* TMS - Tetramethylsilane - A colorless liquid commonly used as a reference standard. | * TMS - Tetramethylsilane - A colorless liquid commonly used as a reference standard. The peak of TMS is used to set a reference of where zero is. | ||
* Proton NMR - What they really mean is a Hydrogen Atom. | * Proton NMR - What they really mean is a Hydrogen Atom. | ||
* Probe - The detector of an NMR. Most commonly, this is Hydrogen-1, but probes for other elements exist. The probe is ultimately just a coil, but it is tuned to the element of interest. | * Probe - The detector of an NMR. Most commonly, this is Hydrogen-1, but probes for other elements exist. The probe is ultimately just a coil, but it is tuned to the element of interest. | ||
* PPM - The unit "chemical shift" is measured in when looking at NMR spectra (x-axis). This corresponds to the shift from the reference frequency from 0ppm. | |||
== History == | == History == | ||
* First generation instruments would use a constant RF frequency but ramp the magnetic field up slowly, and this is in fact what this unit did in its original form. | * First generation instruments would use a constant RF frequency but ramp the magnetic field up slowly, and this is in fact what this unit did in its original form. | ||
