lecture2_bloch - Todays Lecture 2) Fri, Oct 2: Behavior of...

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A. S. Edison University of Florida 2009 Today’s Lecture 2) Fri, Oct 2: Behavior of nuclear spins in a magnetic field II a. Bloch equations b. Phenomenological introduction to T1 and T2 c. RF Pulses d. “Teach Spin” apparatus
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A. S. Edison University of Florida 2009 μ = γ I The magnetic moment ( μ ) is a vector parallel to the spin angular momentum (I). The gyromagneto (or magnetogyro) ratio ( γ ) is a physical constant particular to a given nucleus. Bulk Magnetization Recall from lecture 1: Unfortunately, the vast majority of the magnetic moments cancel one another. The “Boltzmann excess” in the α state add together to create bulk angular momentum (J) and magnetization (M). J = I å M = m å
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University of Florida 2009 Gyroscopes! Classical physics tells us about the motion of a magnet in a magnetic field d t dt t t J M B ( ) ( ) ( ) = × This is very similar to the motion of a spinning gyroscope or top in a gravitational field d t dt m L r g ( ) = × L (t) is the gyroscope’s
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This note was uploaded on 07/30/2011 for the course BCH 6475c taught by Professor Edison during the Fall '09 term at University of Florida.

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lecture2_bloch - Todays Lecture 2) Fri, Oct 2: Behavior of...

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