4.3.1 Hyperfine Nuclear Interaction
The electron magnetic moment and the nuclear magnetic moment interact, modifying the microwave absorption. The number of single resonances increases,
although they are centered on a unique resonance field H r which corresponds to the
absorption field in the absence of electron–nucleus interaction.
H eff ¼ H þ H local
H local is due to nuclear interaction. From the quantum mechanical approach for
the spin nuclear momentum I, 2I + 1 components are expected. In the case of
hydrogen atom I = ½ M I = ± ½, the spectrum shows two resonances.
H eff ¼ H Æ a=2 ¼ H Æ aM i ðwhere a is a measure of the interactionÞ
The energy of hyperfine interaction in the isotropic form was investigated by
Fermi and is defined with the following equation.
Fig. 4.7 Electron spin resonance spectrometer
4.3 Electron Spin Resonance
75
The electron magnetic moment and the nuclear magnetic moment interact, modifying the microwave absorption. The number of single resonances increases,
although they are centered on a unique resonance field H r which corresponds to the
absorption field in the absence of electron–nucleus interaction.
H eff ¼ H þ H local
H local is due to nuclear interaction. From the quantum mechanical approach for
the spin nuclear momentum I, 2I + 1 components are expected. In the case of
hydrogen atom I = ½ M I = ± ½, the spectrum shows two resonances.
H eff ¼ H Æ a=2 ¼ H Æ aM i ðwhere a is a measure of the interactionÞ
The energy of hyperfine interaction in the isotropic form was investigated by
Fermi and is defined with the following equation.
Fig. 4.7 Electron spin resonance spectrometer
4.3 Electron Spin Resonance
75