磁共 Signal from the proton of Ho ce in the absent of Hb Magnetic moments of H split the signal from H into two peaks of equa Two magnetic orientations of Hb- intensity, a 1: 1 doublet Applied field, Bo (b) FIGURE 13 21 Signal splitting arising from spin-spin coupling with one nonequivalent proton of a neighboring hydrogen atom. A theoretical analysis is shown in(a) and the actual appearance of the spectrum in(b). The distance between the centers of the peaks of the dou- blet is called the coupling constant, Jab. The term Jab is expressed in hertz. The magnitudes of coupling constants are not dependent on the magnitude of the applied field and their values (in Hz) are the same, regardless of the operating frequency of the spectrometer