103
edits
Changes
Jump to navigation
Jump to search
Line 67:
Line 67: + + +
→Terminology
* 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.
* 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).
* Downfield / Deshielded / Higher Energy - Peaks further left on the x-axis (away 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.