bcmb8190_problemSet2

bcmb8190_problemSet2 - additional Hz is contributed by...

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PROBLEM SET 2 BCMB 8190 1) The following amplitudes of a water resonance are observed at the indicated delay times in an inversion recovery experiment. What is the T1 for water? t=0.1s, -28; t= 0.5s, -23s; t=2.5s, -2; 12.5s, 27; 60s, 30. 2) It is frequently important to know the rf field imposed by a spin decoupling coil in an NMR experiment. Suppose we use the decoupling coil to provide a proton excitation pulse and determine that we need to apply rf for 200 us to get a 90 degree pulse. What is the rf field in Tesla? 3) We measure the width of a Lorenzian line in an NMR spectrum to be 2 Hz. If this line width is totally dictated by spin relaxation, what is the T 2 for the site? If one
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Unformatted text preview: additional Hz is contributed by magnet inhomogeniety, what is the T 2 * ? If we multiplied the FID from the last case by an exponential with decay constant of 1s before Fourier transformation, what is the T * 2 ? 4) You are going to acquire a 13 C spectrum of a compound with a 5 sec T 1 and 0.3 sec T 2 * for most carbons. You anticipate resonances over a 200 ppm region at 50 MHz. What values for the following acquisition and processing parameters would you choose in order to optimize signal to noise with minimal sacrifice in spectral resolution and dispersion: a) acquisition time b) number of time domain points c) pulse angle d) delay between acquisitions e) line broadening...
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