NMR: Difference between revisions
From Pumping Station One
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== Terminology == | == Terminology == | ||
* NMR - Nuclear magnetic resonance | * NMR - Nuclear magnetic resonance | ||
* Probe - The detector of an NMR. Most commonly, this is Hydrogen-1, but probes for other isotopes exist. The probe is ultimately just a coil, but it is tuned to the element of interest. There are "wideband" probes that can be tuned to various isotopes as long as they are NMR active. | |||
* Proton NMR - What they really mean is NMR performed with a Hydrogen-1 probe. | |||
* Probe - The detector of an NMR. Most commonly, this is Hydrogen-1, but probes for other | * C-13 NMR - NMR performed with a Carbon-13 probe. | ||
* TMS - Tetramethylsilane Si(CH3)4 - A colorless liquid commonly used as a reference standard. The peak of TMS is used to set a reference of where zero is. | |||
* 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. | * 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. | ||
* Upfield / Shielded / Lower Energy - Peaks occurring closer to 0ppm (near the right side of x-axis). | * Upfield / Shielded / Lower Energy - Peaks occurring closer to 0ppm (near the right side of x-axis). | ||
