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Issue Eur. Phys. J. D
Volume 44, Number 3, September 2007
Page(s) 449 - 457
Section Atomic Physics
DOI 10.1140/epjd/e2007-00217-3
Published online 29 June 2007

Eur. Phys. J. D 44, 449-457 (2007)
DOI: 10.1140/epjd/e2007-00217-3

Fine-structure energy levels, oscillator strengths and lifetimes in Mg-like chromium

Vikas Tayal and G.P. Gupta

Department of Physics, S. D. (Postgraduate) College, Muzaffarnagar (U.P.) (Affiliated to Choudhary Charan Singh University), Meerut (U.P), India

tayalvikas11@rediffmail.com

(Received 27 December 2006 / Received in final form 4 June 2007 / Published online 29 June 2007)

Abstract
Excitation energies from ground state for 86 fine-structure levels as well as oscillator strengths and radiative decay rates for all fine-structure transitions among the levels of the terms (1s22s22p6)3 s2(1S), 3s3p(1,3P$^{\rm o})$, 3s3d(1,3D), 3s4s(1,3S), 3s4p(1,3P$^{\rm o})$, 3s4d(1,3D), 3s4f(1,3F$^{\rm o})$, 3 p2(1S, 3P, 1D), 3p3d(1,3P$^{\rm o}$, 1,3D$^{\rm o}$, 1,3F$^{\rm o})$, 3p4s(1,3P$^{\rm o})$, 3p4p(1,3S, 1,3P, 1,3D), 3p4d(1,3P$^{\rm o}$, 1,3D$^{\rm o}$, 1,3F$^{\rm o})$, 3p4f(1,3D, 1,3F, 1,3G) and 3 d2(1S, 3P, 1D, 3F,1G) of Cr XIII are calculated using extensive configuration-interaction (CI) wave functions obtained with the CIV3 computer code of Hibbert. The important relativistic effects in intermediate coupling are included through the Breit-Pauli approximation via spin-orbit, spin-other-orbit, spin-spin, Darwin and mass correction terms. Small adjustments to the diagonal elements of the Hamiltonian matrices have been made. The mixing among several fine-structure levels is found to be very strong. Our excitation energies, including their ordering, are in excellent agreement (better than 0.5%) with the available experimental results. From our transition probabilities, we have also calculated radiative lifetimes of some fine-structure levels. Our calculated lifetime for the longer-lived level 3s3p(3P1) is found to be in excellent agreement with the experimental result of Curtis compared to other theoretical calculations.

PACS
32.10.Fn - Fine and hyperfine structure.
32.70.Cs - Oscillator strengths, lifetimes, transition moments.
95.30.Ky - Atomic and molecular data, spectra, and spectral parameters (opacities, rotation constants, line identification, oscillator strengths, gf values, transition probabilities, etc.).

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2007


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