Changes

* 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.

* 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). They require less energy to bring them into resonance.

* Downfield / Deshielded / Higher Energy - Peaks further left on the x-axis (away from 0ppm).

* Downfield / Deshielded / Higher Energy - Peaks further left on the x-axis (away from 0ppm), require more energy to bring them into resonance.

== History ==

== History ==