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Pulse EPR Theory If we are not exactly on resonance with the center of a symme tr ic signa l, w e will get an oscillation between the real and imaginary components. Figure 2-31 The effect of a frequency shift. These practical examples demonstrate that if we make use of the Fourier transform pairs, properties, and convolution theorem, we can easily envision how signals appear in both time and frequency domains. We do not have to perform any complicated mathematical operations to Fourier transform our signals. We can visually estimate the appearance of signals in both the time and frequency domains. Even though this intuitive ability is not mandatory, it comes in very handy later on when we shall be adjusting parameters and processing data. 2-32
