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Energy levels and classified lines of 4p2(4f + 5p) configurations of Br III

  • Regular Article – Optical Phenomena and Photonics
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Abstract

The 4s24p2 (4f + 5p) configurations of doubly ionized bromine (Br III) have been investigated in the 750–4520 Å wavelength region. The spectrum of bromine in the vacuum ultraviolet wavelength region was photographed on a 3-m normal incidence vacuum spectrograph at the St. Francis Xavier University, Antigonish (Canada) using a triggered spark source. These data were supplemented up to 4600 Å from published results. The structure of Br III is As I-like ion with ground configuration 4s24p3. The theoretical structure was predicted using Cowan’s configuration interaction (CI) code in HFR mode. The excitations from the ground configuration to 4s4p4 + 4s24p2 (4d + 5d + 6d + 5s + 6s + 7s) of even parity system have been investigated recently in our laboratory. In this paper, the second excitations of these excited configurations to 4s24p2 (5p + 4f) in the odd parity system have been studied. Relativistic Hartree–Fock (HFR) and least-squares-fitted parametric calculations have been used to interpret the observed spectrum. Out of 51 possible levels of 4p2 (4f + 5p), 49 levels have been established, 39 being new. With current study of 4p2 (4f + 5p) configurations, it became possible to established 4 unknown J = 9/2 levels of 4p2 (4d & 5d) configurations. Two hundred twenty-five spectral lines are classified.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: The associated data is available in the Article (cited as Ref. 6 in this article) and DOI link is: https://doi.org/10.1016/j.jqsrt.2014.11.010.]

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Acknowledgements

I would like to acknowledge St. Francis Xavier University, Antigonish (Canada), for the local hospitality provided to Prof. Tauheed Ahmad, Department of Physics, A.M.U., Aligarh (India), during the recording of bromine spectra. I also would like to acknowledge Prof. Tauheed Ahmad for support during analysis of Br III spectrum.

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Authors and Affiliations

  1. Department of Physics, Gandhi Faiz-e-Aam College, Shahjahanpur, U.P., 242001, India

    Riyaz Ahemad

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  1. Riyaz Ahemad
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Ahemad, R. Energy levels and classified lines of 4p2(4f + 5p) configurations of Br III. Eur. Phys. J. D 76, 34 (2022). https://doi.org/10.1140/epjd/s10053-022-00339-0

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  • DOI: https://doi.org/10.1140/epjd/s10053-022-00339-0

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