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Pulsed NMR

Pulsed NMR remains one of the most important experimental tools for physicists, since it provides a unique non-invasive probe to study both the internal structure and motions of solids and liquids with magnetic nuclei. PNMR is the basis of powerful medical and biological imaging devices with wide applicability. The “Bloch Equation” will form the theoretical basis for this exploration of Pulsed Nuclear Magnetic Resonance. This will include effective fields in rotating coordinate systems, precession, spin-flips, relaxation processes, spin echoes, and Fourier transform spectroscopy.

The session will begin with the observation of a classical model of both precession and spin-flip using the (Teachspin) “Magnetic Torque” apparatus. Participants will then perform 21MHz single-pulse proton NMR experiments on liquids to familiarize themselves with tuning the spectrometer. The heart of the Immersion will be the measurement of the spin-spin and spin-lattice relaxation times of a series of copper sulfate doped water samples. Time permitting, we will tune the spectrometer for fluorine samples and study the FFT signals from various liquids.

Participants will gain experience in RF tuning and matching circuits, use of magnetic field gradient coils, and FFT spectroscopy.