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We investigated the optical properties of Co 2+ cations in the aqueous and alcoholic solution of CoCl2 · 6H2O at room temperature. We measured the absorption spectra of these solutions in the spectral region 395800 nm.The Racah parameters and the exchange integrals of the aqueous complex [Co(H2O)6] 2+ are calculated. The parameters Dt and Ds are also calculated on the basis of our experimental data. The parameters δσ and δπ which are connected with the symmetry of this complex are also determined.

The activity of a growth centre, consisting of two transversal screw dislocations with equal Burgers' vectors at constant supersaturation and temperature, is theoretically discussed. A non-linear squared differential equation of the type describing oscillations in autonomous systems is obtained and solved approximately and numerically. The correlation theory -experiment is analysed and the applicability of the results is assessed.