Part I The magneto-optical rotation of transition-metal complexes Part II The magneto-optical rotation of organic molecules (one electron calculation)

In Part I, the crystal field theory is applied to calculate the Faraday rotation of cobalt (II) tetrachloride due to A2 - Tl transition. Kramers' equation for the Faraday rotation is used., The discrepancy between the theoretical calculation and the experimental result is about a factor of four , It, is concluded that the ratio of the rotatory strengths due to the transitions A2 + Tl(P) and A2 Tl(F) is approximately 1/10, and also that the rotational strengths of the cobalt (II) ion would have different signs depending on whether the cobalt (II) ion is subjected to the weak or strong tetrahedral crystal field. In Part II, one electron theory originally developed for calculating natural optical rotation is applied to evaluating the Faraday rotation of acetic acid molecules due to n􁪽n* transition of the carbonyl group. Two types of perturbing potential from the vicinal atoms, i.e., point charge perturbing potential and the potential Lal, due to the incomplete screening, are considered and compared. Unlike natural optical rotation, the contributions from vicinal atoms are not additive. Semi-empirical calculation of the Faraday rotation is discussed