By L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)

ISBN-10: 0080229530

ISBN-13: 9780080229539

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Additional resources for Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry

Example text

On the other hand, the internal lock is intrinsically more stable since it stabilizes precisely that region of the applied field experienced by the sample. In addition, the facility of frequency as well as field sweep is useful for spin-decoupling experiments (Chapter 2-4) and the technique can be further elaborated to provide some degree of automatic control of homogeneity. B. r. absorption signal. It is important to be aware of these factors and to take them into account before attempting to assign lines in a spectrum.

F. field. This shape is an infinite cylinder provided the sample extends well above and below the transmitter coil which is coaxial with the sample tube. If the sample has a length comparable with the coil, Ns takes on a range of values near the two ends and poor homogeneity results. Therefore the size of the sample is chosen so as to extend well beyond the region of effective coupling. If the geometry of the sample is spherical rather than cylindrical this problem does not arise and the sample can be reduced in size and still occupy most of the region of effective coupling.

In practice, both methods can be so operated that the rate of change of the field is constant with time; that is a linear sweep is employed. The slow sweep must operate through the stabilizing system (p. 22), if one is employed. With certain types of field-frequency lock systems it is feasible to sweep the observing frequency over a small range. One of the great advantages of field-frequency locked systems or very stable permanent magnets is that the sweep (either field or frequency) can be ganged to the X-avm of an XY recorder so that the position of the Z-arm bears a direct relation to the field/ frequency ratio and hence to the resonance frequencies of nuclei.

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Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry by L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)


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