Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
Section4: An assembly of non-interacting spins PowerPoint Presentation
Download Presentation
Section4: An assembly of non-interacting spins

Section4: An assembly of non-interacting spins

110 Views Download Presentation
Download Presentation

Section4: An assembly of non-interacting spins

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Section4: An assembly of non-interacting spins • Real systems consist of many nuclear spins. • In a static magnetic field, B =Bzk, there is a degeneracy of spin states. • Population difference, n, is given by BOLTZMANN STATISTICS: Boltzmann equation Many spin system: All spins have the same precession frequency,wl=gBz BUT random phases. So Mx and My = 0, and net magnetisation is in z-direction. Bz a M b

  2. Magnetic Resonance: Lecture 5: 4) An ensemble of spins 4.2 Effect of B fields on ensemble of spins (p 31 & p258 Levitt) 4.3 Bloch equations 4.4 The NMR Signal 4) The NMR Spectrometer