CALCULATION OF ELECTRONIC TRANSITION AMPLITUDES AT THE LEVEL OF DIRAC-HARTREE-FOCK THEORY

Abstract

The primary aim of this thesis is the calculation of the electronic transition amplitudes using the Dirac-Hartree-Fock theory. The importance of the forbidden electronic transi tions (M1 and E2) in the atoms and molecules of the spectra of astronomical objects is reviewed, and Dirac-Hartree-Fock formalism is discussed. The Atomic SCF code written in Fortran is used to obtain the SCF energy of closed-shell Mg atom by changing the number of basis functions and using different nuclear models. The latest available ver sion, DIRAC19 is used in the thesis for obtaining the electronic energies of some of the closed-shell atoms and the excitation energy and x component of dipole for velocity and length integral of Mg atom.