Influence of strong collisions on Stark broadening: Quantum and semi-classical calculations for Mo  vi ion

Theoretical electron-impact Stark widths are presented for 10 spectral lines of the Rubidium-like ion Mo vi. Molybdenum is an element of high priority for plasma diagnostics in fusion research and for the analysis of hot stellar atmospheres. The Mo vi has been recently detected in the hot white dwarfs G191–B2B and RE 0503–289. The atomic structure, including energy levels and radiative data, is calculated using the superstructure (SST) and compared to the Multiconfiguration Dirac-Hartree-Fock (MCDHF) results and to the data from the NIST database to ensure the accuracy of the wavefunctions. The Stark broadening parameters are determined using two independent theoretical frameworks: a full quantum mechanical formalism and the semi-classical perturbation (SCP) method. The primary objective of this work is to investigate the influence of strong collisions and elastic contributions on the total Stark width. By comparing these two approaches, we examine the role of close-encounter interactions and the limitations of semi-classical cut-off procedures in highly charged ions. This study provides the first systematic set of quantum Stark broadening data for Mo vi, offering reliable parameters for the modelling and diagnostics of high-density plasmas. Results will be also implemented into the database of Stark broadening parameters STARK-B.