Unformatted text preview: 2 s or T 2 *  the apparent decay constant of the FIDs. T 2 * = 0.106s, T 2 * = 0.080s 4) a) acquisition time should be approximately T 2 *, or 0.3s b) the dwell time should be 1/(spectral width) or 1/10000 s. For a 0.3 s acquisition one needs at least 3000 complex points; the nearest power of two is 4096. c) the Ernst formula says cos( π /2(pw/pw90)) = exp(aq/T 1 ); optimum pulse angle is 20degrees; pw/pw90 = 20/90. d) none if signal to noise is to be optimized e) line broadening should be about 1/ π T 2 or 1Hz if signal to noise is to be optimized....
View
Full Document
 Fall '11
 Gelbaum
 Mole, pH, Nuclear magnetic resonance, optimum pulse angle

Click to edit the document details