[en] Applications were continued of the relativistic random phase approximation and of the model potential method and the properties of highly stripped ionic systems were calculated. Charge transfer recombination and ionization were identified as important processes in plasmas and calculations were performed of rate coefficients for several systems at thermal energies. A theory was constructed of collision-induced fine-structure transitions involving protons and the interaction potentials for O³⁺ - H⁺ were calculated. A study was made of some of the processes that occur when lithium and sodium are subject to laser radiation. Some progress was made towards the development of methods for calculating the effects on atomic systems of intense electric and magnetic fields