Dynamic Nuclei Polarization
Dynamic Nuclei Polarization
Dynamic Nuclei Polarization
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Dream: 100% polarization of a Spin ensemble<br />
In reality not so easy to realize<br />
Interplay between<br />
polarizing force = ^ magnetic field B<br />
and<br />
depolarizing force = ^ thermal motion of Spin particles<br />
(temperature T – relaxation)<br />
Examples:<br />
B = 10 -5 Tesla<br />
T = 25° Celsius<br />
B = 5 Tesla<br />
T = -273° Celsius<br />
B = 1 Tesla<br />
T = 37° Celsius<br />
(earth magnetic field)<br />
(room temperature)<br />
(superconducting magnets)<br />
(refrigerators)<br />
(superconducting magnets)<br />
(body temperature)<br />
P = 10 -12 %<br />
P = 100%NMR (particle physics)<br />
P = 10 -8 % MRI (medicine)
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