Energy levels, radiative rates and electron impact excitation rates for transitions in Be-like Cl XIV, K XVI and Ge XXIX

TL;DR

This paper provides detailed atomic data including energy levels, radiative rates, and electron impact excitation rates for Be-like ions Cl XIV, K XVI, and Ge XXIX, using advanced computational methods and covering a wide temperature range.

Contribution

It presents comprehensive atomic data for specific Be-like ions using relativistic atomic structure and R-matrix calculations, including new resonance-resolved collision strengths and lifetimes.

Findings

Energy levels and radiative rates are calculated with GRASP.

Collision strengths are computed with DARC, including resonance effects.

Results are provided over a broad temperature range up to 10^7.8 K.

Abstract

Results for energy levels, radiative rates and electron impact excitation (effective) collision strengths for transitions in Be-like Cl XIV, K XVI and Ge XXIX are reported. For the calculations of energy levels and radiative rates the General-purpose Relativistic Atomic Structure Package ({\sc grasp}) is adopted, while for determining the collision strengths and subsequently the excitation rates, the Dirac Atomic R-matrix Code ({\sc darc}) is used. Oscillator strengths, radiative rates and line strengths are listed for all E1, E2, M1 and M2 transitions among the lowest 98 levels of the $n \le$ 4 configurations. Furthermore, lifetimes are provided for all levels and comparisons made with available theoretical and experimental results. Resonances in the collision strengths are resolved in a fine energy mesh and averaged over a Maxwellian velocity distribution to obtain the effective collision strengths. Results obtained are listed over a wide temperature range up to 10$^{7.8}$ K, depending on the ion.