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    Iulia ZAI

    The sign of a hyperfine field indicates whether the field that the nucleus “feels” is in either the same (positive) or the opposite (negative) direction as the spin of the electron cloud. Should the hyperfine field be positive, then the spin of the nucleus would be in the same direction as that of the electron cloud and the frequency would increase under the application of an external field. In the given picture: the fact that the peak position shifted to a lower frequency when increasing the intensity of the applied field means that we are dealing with a negative hyperfine field after all.

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