Abstract Details

Name: Madhulita Das
Affiliation: DST Woman scientist
Conference ID: ASI2017_1327
Title : Plasma-screening effects in the astrophysically relevant He-like and Li-like ions
Authors and Co-Authors : Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, India
Abstract Type : Poster
Abstract Category : Stars,ISM and the Galaxy
Abstract : The spectroscopy of plasma embedded atomic and ionic systems are remarkably different from their corresponding isolated candidates. Accurate estimation of the atomic structures and their properties are of immense interest in recent years for their wide range of astrophysical applications. The Relativistic Coupled-Cluster (RCC) method has been employed to study the spectoscopy of atoms and ions in weak and strong plasma environment by using Debye and Ion Sphere model, respectively. By using this techniques, the energy levels and transition properties of He-like and Li-like ions have been calculated in hot and dense plasma environments. Due to the plasma environment, the ionization and excitation energies as well as the oscillator strengths change considerably in comparision to plasma free systems. It is also predicted that, there is blue and red shifts in the spectral lines of the embedded plasma ions as the strength of the plasma increases. It is also found that, the quasi-degeneracy among the energy states having same principal quantum number (n) but different angular momentum (l) is slacken as plasma strength increases. These findings would be very useful in the interpretation of spectral properties of atoms and ions embedded in various astrophysical plasmas. These knowledge are very useful in estimating radiative opacity, photoionization cross sections, line intensities, etc of the aforementioned astrophysical plasmas.