IMG_0002_NEW - and direction of magnetic moment is...

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o Nuclear Magnetic Resonance Spectroscopy Note; in'H NMn spectroscopy we refer to hydrogen's as protons. Therefore'H IIMR spectroscopy is also l*town as proton nuclear magnetic resonance spectroscopy. Basic Principle: A11 nuclei carry a charge and in some nuclei this charge spins on the bond axis giving the nuclei unique magnetic properties. (nuclei with an odd number of protons or neutrons or an odd number of both have a spinning charge) Recall: lH I proton, 0 neutrons (odd number of protons) t'C 6 protons, 7 neutrons (odd number of neutrons) As the charged nuclei spins on the end of a bond it creates a small magnetic moment (think of a proton as a bar magnet) recall Right Hand Rule (wrap fingers in direction of spin
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Unformatted text preview: and direction of magnetic moment is direction of thumb) Normally, the magnetic moments are randomly oriented - BUT if you place a molecule in an external magnetic held the magnetic moments will prefer to align with or against the applied magnetic field. The term g spin state describes a situation where the magnetic moment is lined up with the applied field and B spin state describes a situation where the magnetic moment is lined up against the applied magnetic fi.eld. Wich will be higher in energy? \ (lr. /-tu) o v/ \/. c\ /\@ G)\ I / ,,,,n C-(H) \:,/ \ It-@=-* magnetic moment apply magnetic field *+fi+ I Y applied magnetic field (B")...
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This note was uploaded on 12/27/2011 for the course CHEM 281 taught by Professor Williams during the Fall '11 term at Simon Fraser.

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