Figure 4.40 shows the EPR spectra for two isotropic systems in which the unpaired electron interacts with two ''N nuclei (I=1). (a) Use Fig. 4.40a to calculate the gyromagnetic factor of the paramagnetic species if the spectrum was measured at 9.75 GHz. (b) Which EPR spectrum in Fig. 4.40 indicates the interaction of the unpaired electron with two equivalent nitrogen nuclei? (c) Calculate the values of the hyperfine coupling constants for both cases in Fig. 4.40. 3350 3400 3450 3500 3550 3600 Magnetic field, B/gauss Fig. 4.40 EPR spectra for problem 4.55. [Simulated by Dr. C. Palivan, University of Basel.] Figure 4.40 shows the EPR spectra for two isotropic systems in which the unpaired electron interacts with two ''N nuclei (I=1). (a) Use Fig. 4.40a to calculate the gyromagnetic factor of the paramagnetic species if the spectrum was measured at 9.75 GHz. (b) Which EPR spectrum in Fig. 4.40 indicates the interaction of the unpaired electron with two equivalent nitrogen nuclei? (c) Calculate the values of the hyperfine coupling constants for both cases in Fig. 4.40. 3350 3400 3450 3500 3550 3600 Magnetic field, B/gauss Fig. 4.40 EPR spectra for problem 4.55. [Simulated by Dr. C. Palivan, University of Basel.]