By T. W. Körner
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Extra resources for Exercises in Fourier Analysis
E. when they both have magnetic quantum numbers rnA = rnx = -1/2, to yield a resulting magnetic quantum number M = rnA + rnx = -1; the highest energy corresponds to M = + 1 and the two states with M = 0 both have an energy that is close to the one observed in the absence of the external field (Fig. 14). In the absence of spin coupling between the two nuclei, the energy separation between the two M = 0 levels is proportional, at any given H o, to the chemical shift between the two protons and vanishes with vanishing chemical shift.
Accidental overlap of neighboring transitions becomes less probable with improved spectrometer resolution and nearly equal frequency intervals may be distinguished with improved precision in the frequency measurements. The information content may, however, be increased not only by improving the quality of the spectrum but also by supplementing a given spectrum with spectra obtained under other operating conditions. The 41 The Effects of a Strong Stimulating Field most important modifications in operating conditions from our present point of view are: (i) operation at a higher level of the stimulating radio frequency field H 1 ; (ii) a change in NMR parameters, primarily in the Larmor frequencies; (iii) the use of double irradiation techniques.
By simple algebraic operations on the observed frequencies within such subspectra, the values of the NMR parameters may be derived. All these calculations may be performed by means of a slide rule or, for greater precision, with a desk-top calculator. The main difficulty in this approach is to identify the subspectra in the often complex and far from "perfect" NMR spectra encountered in practice. Ambiguities may arise for several reasons. First, it may happen that a number of transitions, that in principle are allowed, have such a low transition probability as to be lost in the background noise under normal operating procedures.