ABSTRACT
Available methods of the determination of principal components of the magnetic susceptibilities and their anisotropies can be divided into several groups. The comparison of the anisotropic susceptibilities for the same molecules in different phases must be rigorous. The limitations of the microwave spectroscopy, connected with molecular polarity, are absent for the double magnetic resonance. It is one of the methods, based on the rotational Zeeman effect in molecular beams. The phenomenon of linear birefringence in a magnetic field was first observed by Kerr in 1901 and by Maioran in 1902 in solutions of colloidal particles of iron and its oxide. The Cotton-Mouton effect, the magnetic birefringence in diamagnetics, is more frequently used in chemical investigations. The magnetic field is regarded as an external factor creating anisotropy in the medium, which is opposed by the random thermal Brownian motion. Properties of the linear magnetic birefringence of complexes in liquid media were analyzed by Styles within the framework of the quantum theory.
