Page "Magnetic circular dichroism" Paragraph 40

Otherwise, it will lead to the C term ( 4 ) of figure 1, which requires the degeneracy of the ground state.

This happens due to a change in the population of molecules over the Zeeman sublevels of a paramagnetic ground state.

In addition, the C term is observed only for molecules with ground state paramagnetism.

Importantly, A and B terms are independent of temperature while the C term is dependent on temperature.

Decrease of the temperature and increase of the magnetic field would further increase the C term intensity until it reaches the maximum ( saturation limit ).

Experimentally, the C term spectrum can be obtained from MCD raw data by subtraction of MCD spectra measured in the same applied magnetic field at different temperatures, while A and B terms can be distinguished via their different band shapes.