L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering's Applications of Nuclear Magnetic Resonance Spectroscopy in PDF

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

ISBN-10: 0080125425

ISBN-13: 9780080125428

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Specialities supply "all glass" tubes with a spherical cavity at the bottom of a wider capillary through which the sample can be introduced by means of a hypodermic syringe. 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 41 (v) ENHANCEMENT OF SENSITIVITY BY TIME-AVERAGING DEVICES The signal-to-noise ratio is a function of the time taken for the observation.

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.

The nuclear induction or crossed-coil system. The Experimental Method 29 method is to employ a phase sensitive detector which permits the operator to select the phase of the signal to be detected. The absorption (or dispersion) signal is extremely weak and requires considerable amplification before it is fed to a chart recorder or oscilloscope. Figures 1-2-6 and 1-2-7 are block diagrams illustrating the two methods. 264 (v) FIELD-FREQUENCY LOCKS Somefield-frequencylocks, as well as other ancillary techniques, depend on the phenomenon known as side-band modulation which is now described.

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Applications 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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