Gyromagnetic ratio
From NMR Wiki
Gyromagnetic Ratio is defined by:
where 
is the magnitude of electron charge, 
is the proton mass, 
is reduced Planck constant, 
is the nuclear magneton, and 
is the g-factor of the nucleon or nucleus in question.
Approximate values for some common nuclei are given in the Table below.<ref>Template:Cite book</ref>
| Nucleus | γ / 2π (MHz/T) |
|---|---|
| 1H | 42.576 |
| 3He | -32.434 |
| 7Li | 16.546 |
| 13C | 10.705 |
| 14N | 3.0766 |
| 15N | -4.3156 |
| 17O | -5.7716 |
| 23Na | 11.262 |
| 31P | 17.235 |
| 129Xe | -11.777 |
For information on individual chemical elements please use NMR and EPR Periodic Table
To find NMR frequency of your favorite nucleus at a given magnetic field, see Alex Jerschow's on-line Interactive NMR Frequency Map
