bcmb8190_p1 - 2) Use the shell model of the nucleus (energy...

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BCMB/CHEM 8190 PROBLEM SET 1 1) Using a table of nuclear properties such as found at http://bouman.chem.georgetown.edu/NMRpt/NMRPerTab.html look through the elements in the first three rows of the periodic table and find all the spin ½ isotopes. What are the receptivities for these nuclei when compared to an equal number of protons? How do they compare if natural abundances are included? How do the receptivities depend on the gyromagnetic ratios? What is the relative receptivity for an equal number of magnetic nuclei at 4K versus 300K?
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Unformatted text preview: 2) Use the shell model of the nucleus (energy level diagram below) to predict the spin and the sign of the gyromagnetic ratio for the following nuclei. Compare them with a table of nuclear properties. 7 Li, 15 N 3.) If the shielding constant for a proton of a methyl group is 60.0 x 10^-6 and that for a proton on a hydroxyl group is 55.2 x 10^-6, what is the difference in precession frequency of the two protons at an 11.7T field? What is the chemical shift difference in ppm?...
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