Ab initio calculations of atomic parameters of Mo XVIII of fusion interest

The relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) method has been employed to calculate the atomic parameters of Mo XVIII, which are important for fusion determination of plasma properties in different conditions. Atomic data, such as energy levels, lifetimes, wavelengths, spectroscopic labels, and transition rates for the transitions among the lowest 112 states of the 3 s(2)3p(6)3d(7), 3s(2)3p(5)3d(8), 3s3 p(6)3d(8), and 3s(2)3p(6)3d(6)4s configurations are given. To describe the atomic system accurately, electron correlation effects are taken into account. We also present a calculation within fully relativistic frame based on the Flexible Atomic Code (FAC). This, in turn, allowed us to make an intercomparison on the obtained data. Our two sets of results are also evaluated by comparison with the NEST database recommended values. The new calculated energy levels are, on the average, about 1.5% higher than NIST database recommended values and yield oscillator strengths within 5% of the theoretical values. This study provides a substantial amount of updated atomic data, which are essential for fusion applications. (C) 2019 Elsevier Inc. All rights reserved.