Indian Journal of Physics

, Volume 88, Issue 1, pp 11–18 | Cite as

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

Original paper
First Online:
Received:
Accepted:

Abstract

We have performed large scale calculations of excitation energies from ground state for 97 fine-structure levels as well as of oscillator strengths and radiative rates for all electric-dipole-allowed and intercombination transitions among the fine-structure levels of the terms belonging to the (1s 22s 22p 6)3s 23p, 3s3p 2, 3s 23d, 3p 3, 3s3p3d, 3p 23d, 3s3d 2, 3s 24s, 3s 24p, 3s 24d, 3s 24f and 3s3p4s configurations of Al-like chromium. These states are represented by very extensive configuration-interaction wave functions obtained with the configuration-interaction version 3 computer code of Hibbert. The important relativistic effects in intermediate coupling are included through the Breit-Pauli approximation. Small adjustments to the diagonal elements of Hamiltonian matrices have been made so that energy splittings are as close as possible to the energy values of the National Institute of Standards and Technology. From the radiative rates, we have also calculated radiative lifetimes of fine-structure levels. Generally, the calculated excitation energies, oscillator strengths and the radiative rates are found to be in good agreement with those obtained from other sophisticated calculations. However, significant differences between present calculated lifetimes and those from the calculation of Fischer and co-workers for a few fine-structure levels are noted and discussed. Also the present calculated lifetime for level 3s 24s(2 S 0.5) is found to be in excellent agreement with the experimental value given by Thornbury and co-workers. With this calculation, we also predict new data for several fine-structure levels, where no other theoretical and/or experimental results are available.

Keywords

Atomic energy levels Oscillator strengths Transition probabilities Lifetimes 

PACS Nos.

32.10.Fn 32.70.Cs 95.30.Ky 
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Notes

Acknowledgments

This research is supported in part by the Division of Chemical Sciences, Office of Basic Energy Sciences, Office of Energy Research, United States Department of Energy (AZM).

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Copyright information

© Indian Association for the Cultivation of Science 2013

Authors and Affiliations

  1. 1.Department of PhysicsS D (Postgraduate) CollegeMuzaffarnagarIndia
  2. 2.Department of Physics, Center for Theoretical Studies of Physical SystemsClark Atlanta UniversityAtlantaUSA

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