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5 Cards in this Set

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What is spin?
Spin is a fundamental property of nature like electrical charge or mass. Spin comes in multiples of 1/2 and can be + or -. Protons, electrons, and neutrons possess spin. Individual unpaired electrons, protons, and neutrons each possesses a spin of 1/2.
Properties of Spin
When placed in a magnetic field of strength B, a particle with a net spin can absorb a photon, of frequency v. The frequency depends on the gyromagnetic ratio, y of the particle.
Nuclei with Spin

Nuclei
Unpaired Protons Unpaired Neutrons
Net Spin
(MHz/T)
1H 1 0 1/2 42.58
2H 1 1 1 6.54
31P 1 0 1/2 17.25
23Na 1 2 3/2 11.27
14N 1 1 1 3.08
13C 0 1 1/2 10.71
19F 1 0 1/2 40.08
Energy Levels
When the proton is placed in an external magnetic field, the spin vector of the particle aligns itself with the external field, just like a magnet would. There is a low energy configuration or state where the poles are aligned N-S-N-S and a high energy state N-N-S-S.
Spin Packets
A group of spins experiencing the same magnetic field strength.

The vector sum of the magnetization vectors from all of the spin packets is the net magnetization.