1 / 2

Section4: An assembly of non-interacting spins

Section4: An assembly of non-interacting spins. Real systems consist of many nuclear spins. In a static magnetic field, B =B z k , there is a degeneracy of spin states. Population difference, n , is given by BOLTZMANN STATISTICS:. Boltzmann equation. Many spin system:.

barrett-mayer
Télécharger la présentation

Section4: An assembly of non-interacting spins

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

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

More Related