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'Adiabatic Fast Passage'
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Adiabatic Fast Passage
(AFP)
Adiabatic
fast passage is a
NMR
technique of producing rotation of the macroscopic
magnetization vector
by shifting the
frequency
of RF
energy
pulses (or the strength of the
magnetic field
) through
resonance
(the
Larmor frequency
) in a time short compared to the relaxation times. Particularly used for
inversion
of the spins between high and low
energy
states with an excess of
spins
in the higher
energy level
. A
continuous wave NMR
technique used in e.g.,
MR spectroscopy
.
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Adiabatic Fast Passage
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Further Reading:
Basics:
Adiabatic theorem
by
en.wikipedia.org
News & More:
New theory of adiabaticity developed
Tuesday, 2 December 2008
by
www.upi.com
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Adiabatic Rapid Passage
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Further Reading:
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Adiabatic theorem
by
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Inversion
A nonequilibrium state in which the
macroscopic magnetization vector
is oriented opposite to the
magnetic field
; usually produced by
adiabatic fast passage
or 180° RF pulses.
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