Donut Spectroscopy: Homer Simpson Guide to NMR

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Presentation transcript:

Donut Spectroscopy: Homer Simpson Guide to NMR Dwight Chambers HSSP March 8, 2008 Background Credits: http://www.isis.rl.ac.uk/DataAnalysis/e-science/2004_povs/jpegs/1000xMAGNETS_final.jpg

What is Magnetism? Where does it come from? What “carries” magnetism? How does it affect normal matter? What are some examples of natural magnetic fields? Image Credits: http://www.richardschiropractic.com/blog1/uploaded_images/magnetic-field-767764.jpg

Magnetism: Where does it come from? The Earth? Magnets? - Compass Wires? DEMO?!?!?! Moving Charges! Faraday’s Law:

What “carries” magnetism? Charge Electrons PROTONS! NUCLEI! Monopoles? Dipolar fields http://www.monos.leidenuniv.nl/smo/basics/images/wave.gif

How does magnetism affect normal matter? Torque dM/dt = M x B Right Hand Rule Induction: Are we magnetic? Zeeman Splitting: µ · B Kinds of Magnetic Material: Ferromagnetic, Diamagnetic, Paramagnetic

What are some examples of natural magnetic fields? The Earth: .3 - .6 Gauss Neutron Star: <108 Gauss NMR: 104 - 205 Gauss Image Credit: http://www.ngdc.noaa.gov/seg/geomag/icons/solarexp.jpg

NMR BASICS Nuclear Magnetic Resonance Protons / Neutrons Spin / Magnetic Moment Resonance Zeeman Energy Image Credits: http://michaelgr.files.wordpress.com/2007/05/nmr-protein-001.jpg

NMR Schematic Main Magnetic Field Radio Frequency Coils Superconducting Radio Frequency Coils Transmit and Detect ADC -> Computer Image Credit: http://www.chem.ucalgary.ca/courses/351/Carey/Ch13/1305.gif

Imaging Basics Ways to define an image: Source - Image Model Resolution Field of View Source - Image Model Point Spread Function Convolution Image Credits: http://www.csupomona.edu/~apfelzer/demos/convolution/calculation/calculation-gifs/graphconvol-gifs/2a.gif

http://www.mri-ct.com/images/kneemr.jpg

http://www.theteenbrain.com/resources/brain_science/images/fmri_image.jpg

http://www. people. cornell http://www.people.cornell.edu/pages/fs31/images/research_projects/oligocyclic/oligocyclic_DQF-COSY-1.gif