By L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)
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Extra info for Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry
B . J o h n s , University of Melbourne). T h e 6 0 M H z and 1 0 0 M H z spectra were obtained o n different horizontal scales, s o that the dimensionless (ppm) scales coincide. The higher dispersion of the 1 0 0 M H z spectrum is evident from its first-order character (cf. Chapter 2 - 3 C). The Experimental Method IS magnets have realised fields corresponding to 230 MHz. An excellent example of the advantage of very high fields is provided by the determination at 200 MHz of the very similar chemical shifts of the aromatic protons in alkyl aromatic hydrocarbons, a task which would have been exceedingly 3 25 difficult or even impossible at 100 MHz or less.
Samples from gas-liquid chromatograms can be directly trapped into this device. The wider capillary results in slight deterioration in resolution. Successful operation with spherical sample containers requires considerable care with regard to the positioning of the cell in the probe of the spectrometer. The Experimental Method (v) ENHANCEMENT OF SENSITIVITY BY 41 TIME-AVERAGING DEVICES The signal-to-noise ratio is a function of the time taken for the observation. Perhaps the easiest way to understand this is to consider the sum of a number of recordings of a peak in a spectrum.
Field, the frequency of which is constant. The result is the characteristic ringing pattern illustrated in Fig. l-2-14a. Evidently the shorter the relaxation times 7\ and T2, the less will be the distortion due to ringing. Since T2 includes the field inhomogeneity (p. 8) the observation of ringing is a good indication of a homogeneous field. 36 An Introduction to NMR Spectroscopy The obvious way of removing the unwanted ringing from recorded signals is to use a slow sweep. There are, however, several factors which place a lower limit on permissible sweep rates.