Optical activity originated by ring of coupled oscillators

This paper presents the theory of the optical activity of ring of coupled based on the generalized Rosenberg relations for the complex rotatory power. The rotational strengths of the quantum-mechanical transitions of normal modes of vibrations for the arbitrary propagation direction of the electromagnetic wave are calculated by relatively simple way. In real materials, the valence electrons can be represented by the harmonic oscillators. Therefore, this theory can be used for the solution of the optical activity of molecules when the optical activity is based on the dipole–dipole interactions between the valence electrons. One of such molecules can be the molecules of the SUA crystal, the optical activity of which follows from the optical activity of single molecules. It is shown that using the model of ring of coupled oscillators, better dispersion relations for the optical activity of this crystal can be obtained. As example, the interpretation of one isolated peak of the circular dichroism of the SUA crystal is shown as an example.