I would like to determine the Larmor frequency of 57Fe in the earth's ambient magnetic field. Properties \ Nuclide 57Fe Nuclear Spin, I 1/2 Nuclear magnetic moment, µ +0.09044 Gyromagnetic Ratio (rad T-1 s-1) 0.8661 x 10 7 Quadrupole moment (m2) 0 Relative Sensitivity (1) 3.37 x 10 -5 Natural Abundance, % 2.1 Half-life,T1/2 stable Absolute Sensitivity (2) 4.2 x 10 -3 Frequency (MHz) @ 2.3488 T 3.231 There is of course an North/South, East/West, and Vertical component which makeup the total magnetic field strength. 1. How would I calculate the Larmor frequency? 2. Do all the magnetic field components need to be accounted for? I have found related pages on hyperphysics.com but do not have the background to follow everthing presented, therefore, unable to determine the values to plug into the formulas. Any help would be greatly appreciated.