2017_Imaging for Physicits_Florence

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Page Background

Quantized nuclear spin

• Nuclear spin is a form of angular momentum

• Nuclear spin,

I

, is quantized in units of

ℏ

• Nuclear quantum number depends on nuclear

configuration; I=1/2, 1…

• Hydrogen has spin I=1/2, with spin projection

numbers m

I

=+1/2 , -1/2; spin ‘up’ or ‘down’

• Magnetic moment is

μ

=γ

I

Gyromagnetic ratio