Dipole Transitions in Atoms and Ions With One Valence Electron

Oscillator strengths, atomic transition probabilities and photoionisation cross-sections have been calculated for alkali-like atoms and ions, i.e., for atomic systems with one valence electron outside the spherical core. Calculations have been performed in one-electron approximation with allowance for polarisation of the core by an external electric monochromatic field. The including of this effect leads to a change of the matrix element ⟨r⟩ to ⟨r-q⟩, where q describes the induced dipole moment of the core. The polarisation effect strongly influences on the ratio of doublet in the principal series f3/2/f1/2, on the behaviour of the photoionisation cross sections (including inner shells) and the excitation cross sections for optical transitions induced by electron impact. Numerical calculations have been made for the atoms Li I, Na I, K I, Cu I, Rb I, Cs I, Ag I, Au I and ions Mg II, Al III, Ca II, Zn II, Ga III, Sr II, Cd II, In III, Ba II and Hg II.