Research Unit: LASER AND SPECTROSCOPY

Sub-group: PLASMA SPECTROSCOPY

My research activity is focused on plasma spectroscopy.
We study the light emitted from laboratories and stellar plasmas.
The modeling of the plasmas of neutral atoms, singly ionized and multicharged ions permits to make the diagnosis of such plasmas (determination of the temperature and the density of the plasma).
From the calculation of the profiles of spectral lines emitted by stars, one can deduce the characteristics of their atmospheres.
We calculate energy levels and oscillator strengths for atoms and ions.
We calculate collision strengths for collisions in plasma between electrons and atoms or ions.
We calculate also widths and shifts of lines emitted by a laboratory or astrophysical plasmas.
One of our new techniques is the study of line ratio which is a good diagnostic of plasmas.

Selected recent publications:

• Alwadie, N.,  Almodlej, A., Ben Nessib, N., Dimitrijević, M. S. « The fully relativistic multiconfiguration Dirac-Hartree-Fock method for atomic structure calculations for multiply charged ions: The example of Ca XV », EPJD, 75, 35, 2021.
• Alwadie, A. Almodlej, N. Ben Nessib, and M. S. Dimitrijević « Atomic structure of the carbon like ion Ca XV », Contributions of the Astronomical Observatory S. Pleso, 50, 86, 2020.
• Alwadie, A. Almodlej, N. Ben Nessib, and M. S. Dimitrijević « Atomic structure of the carbon like ion Ca XV », Contributions of the Astronomical Observatory S. Pleso, 50, 86, 2020.
• Almodlej, N. Alwadie, N. Ben Nessib, and M. S. Dimitrijević « On the Stark broadening of some Cr II spectral lines in plasma », Contributions of the Astronomical Observatory S. Pleso, 50, 147, 2020.
• R. Hamdi, N. Ben Nessib, S. Sahal-Bréchot and M. S. Dimitrijević « On the semiclassical perturbation Stark shifts of Ar II spectral lines », Contributions of the Astronomical Observatory S. Pleso, 50, 128, 2020.
• R. Hamdi, N. Ben Nessib, S. Sahal-Bréchot, M. S. Dimitrijević « Semiclassical perturbation Stark shifts of singly charged argon spectral lines », Monthly Notices of the Royal Astronomical Society 488 (2), 2473-2479, 2019.
• A. Almodlej, R. Alraddadi and N. Ben Nessib « Energy levels and oscillator strengths for carbon isoelectronic sequence from C I to Ne V », EPJ Plus, 133, 379, 2018.
• Nafeesah Abdul Rahim Yaqub, Rabia Qindeel, Norah Alonizan and Nabil Ben Nessib « Expectation Values of the Neutral Chromium Radius », Atoms, 6, 51, 2018.
• Hamdi R., Ben Nessib N., Sahal-Bréchot S., Dimitrijević M. S., « Semiclassical perturbation Stark widths of singly charged argon spectral lines », MNRAS, 475, 800, 2018.
• Hamdi R., Ben Nessib N., Sahal-Bréchot S., Dimitrijević M. S., « Stark Widths of Ar II Spectral Lines in the Atmospheres of Subdwarf B Stars », Atoms, 5, 26, 2017.

• S. Sahal-Bréchot, M. S. Dimitrijević, N. Moreau and N. Ben Nessib  « The STARK-B database VAMDC node », AIP Conference Proceedings 1811(1): 030003 · March 2017.
• A. Al-Towyan, N. Ben Nessib, N. Alonizan, R. Qindeel  and N. Yacoub  « Stark widths dependence on electron temperature  for neutral chromium spectral lines », The European Physical Journal – Plus, 131, 9 , 2016.
• N. Alonizan, R. Qindeel, N. Ben Nessib « Atomic Structure Calculations for Neutral Oxygen », International Journal of Spectroscopy, 2016, 7p , 2016.
• N. Alonizan, R. Qindeel, N. Ben Nessib, S. Sahal-Bréchot and M. S. Dimitrijević « On the Stark broadening parameters for neutral oxygen spectral lines », J.A.A, 2015.
• S. Sahal-Bréchot, M. S. Dimitrijević, N. Moreau and N. Ben Nessib  « The STARK-B database VAMDC node: a repository for spectral line broadening and shifts due to collisions with charged particles », Physica Scripta, 90, 054008, 2015.
• N. Ben Nessib, N. Alonizan, R. Qindeel, S. Sahal-Bréchot and M. S. Dimitrijević « The OIV 1407.3 Å /1401.1 Å emission-line ratio in a plasma », Ad. Sp. Research, 54, 1190, 2014.
• S. Sahal-Bréchot, M. S. Dimitrijević, N. Moreau and N. Ben Nessib « The STARK-B database as a resource for ``STARK'' widths and shifts data: State of advancement and program of development », Ad. Sp. Research, 54, 1148, 2014.

Master and Ph.D students that I have supervised:

• Najah Alwadie, Ph.D Thesis "Energy levels, oscillator strengths, transition probabilities and spectral line widths for multicharged carbon-like Ca XV ion in a plasma", January 2021.
• Lubna Ma’mon Ali Afaneh, Master Thesis “Atomic and spectroscopic parameters of copper in plasma”, May 2017
• Abeer Saleh Al-Towyan, Ph.D Thesis, “Calculation of spectral line broadening of chromium in plasma, January 2017
• Ibtisam Hussin Salem Al-Qahtani, Master Thesis, “ Calculation of atomic and collisional data for singly ionized chromium in plasma”, May 2016
• Nafeesah Abdul-Rahim Yaqub, Master Thesis, “Calculation of atomic and collisional data for neutral chromium in plasma”, May 2015.