Calculated energy levels and lifetimes in Ca X

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2006-12, Vol.39 (23), p.4977-4984
• Main Authors: Gupta, G P, Msezane, A Z
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Atomic properties and interactions with photons; Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations); Electronic structure of atoms, molecules and their ions: theory; Exact sciences and technology; Fine and hyperfine structure; Intensities and shapes of atomic spectral lines; Oscillator strengths, lifetimes, transition moments; Physics; Properties of atoms and atomic ions
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/0953-4075/39/23/014

Excitation energies of the lowest 30 fine-structure levels as well as of oscillator strengths and radiative decay rates for transitions among the terms belonging to configurations within the principal quantum number n = 6 of Na-like calcium, are calculated using configuration-interaction (CI) wavefunctions. These wavefunctions are obtained using the CIV3 computer code of Hibbert. The important relativistic effects in intermediate coupling are incorporated by means of the Breit-Pauli Hamiltonian. In order to keep our calculated energy splittings as close as possible to the experimental values, we have made small adjustments to the diagonal elements of the Hamiltonian matrices. Our excitation energies, including their ordering, are in excellent agreement with the available experimental results. From our transition probabilities, we have also calculated radiative lifetimes of all fine-structure levels. The significant difference between the experimental results of Trabert et al (1996 J. Phys. B: At. Mol. Opt. Phys. 29 2647) and the existing theoretical values for the lifetimes of several levels is discussed and explained.