Structural atomic data and collisional ionization cross-sections by electron impact of P-like tungsten, W59+

This study provides comprehensive atomic data and electron-impact ionization cross-sections for phosphorus-like tungsten (W[Formula: see text]), a critical species in fusion plasma diagnostics. The present calculations were performed using the Multi-Configuration Dirac-Hartree-Fock (MCDHF) approach and the Flexible Atomic Code (FAC) to determine energy levels, oscillator strengths, transition probabilities and radiative lifetimes for fine-structure levels belonging to 3s 2 3p 3 , 3s3p 4 , 3p 5 , 3s 2 3p 2 3d, 3s 2 3p 2 4s, 3s 2 3p 2 4p, 3s 2 3p 2 4d and 3s 2 3p 2 4f configurations. The relativistic effects are included in both MCDHF and FAC methods. Furthermore, quantum electrodynamics effects and upper-level correlations are also included in the present calculations. Electron-impact ionization cross-sections for the ground level (3s 2 3p[Formula: see text] were computed as a function of incident electron energy (0–250[Formula: see text]keV), revealing a threshold cross-section of [Formula: see text] [Formula: see text]cm 2 at [Formula: see text]18.5[Formula: see text]keV. The present data demonstrates excellent agreement between both methods for atomic structure parameters and aligns with existing theoretical benchmarks. These data address a critical gap for modeling tungsten transport and radiation in magnetic confinement fusion devices, such as ITER.