By T. H. Wilmhurst
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Additional resources for Electron Spin Resonance Spectrometers
Another way of considering the above effect is to recall that the absorptive component of the sample voltage is equivalent to a small additional resistance placed in the circuit and the dispersive component to a small reactance. If, now, the current flowing through the detector in Fig. 14 is plotted against the circuit reactance, a response curve similar to Fig. 1. 9 will be obtained. Thus, when the circuit is at resonance, the slope of the curve which determines the sensitivity to a small change in reactance is zero, and so only a second-order response to the sample reactance is obtained.
Is to place the sample in a coil and to pass through the coil a current at the frequency for nuclear resonance. The sample experiences a linearly polarized, sinusoidally varying magnetic field, which must be arranged to be at right angles to the field provided by the magnet. The appropriate rotating component of the linearly polarized field then sets up a rotating component of magnetization within the sample. f. in the coil. f. is proportional to the rate of change of flux and, therefore, to the rate of change of magnetization, and leads the magnetiza· tion by 90°.
Thus the amplitude of the vector sum of the two signals is a curve with a shape somewhat similar to that for the absorption line. The form of the curve is not exactly the same however, ---Jl--iDispersioni Dispersion phase A fo f,---4--------4TJ,----Absorption phase 0 \r -jAbsorptia> B Fig. 15. Vector diagram showing combination of absorption and dispersion signals from sample. and, in particular, the width is slightly increased. R. Spectrometers signal, but, at these frequencies, the height of the combined signal is only reduced by l/y2 from its maximum.
Electron Spin Resonance Spectrometers by T. H. Wilmhurst