Energy levels and spectral lines for Ge-like Zr, Nb, and Tc ions

Abstract

The energy levels, transition probabilities, oscillator strengths, line strengths, and wavelengths of Ge-like Zr, Nb, and Tc ions have been calculated using the multi-configuration Dirac–Hartree–Fock method. The Breit interactions and quantum electrodynamics correction were taken into account. The calculated values of energy levels and wavelengths have been compared with other theoretical calculations and available experimental values; good agreement is achieved for most of the energy levels and wavelengths calculated. The number of energy levels and wavelengths considered is larger than that of any other theoretical calculations, and the transition probabilities and line strengths are also given where no other theoretical results and experimental values are available.