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Systematic investigations of level delocalization and spectroscopy of hydrogen atom subjected to a plasma environment using various statically screened potentials

The description of the plasma effect using an accurate screened potential, which is crucial for many applications of plasma physics, represents a hitherto challenge for theory. Here, we present a theoretical determination of the level delocalization and transition rate of an exemplary hydrogen atom immersed in plasmas. Specific forms of the screened potentials include the average-atom, the standard ion-sphere, and those recently proposed by Shukla and Eliasson [Phys. Rev. Lett. 108, 165007 (2012)], Akbari-Moghanjoughi [Phys. Plasmas 22, 022103 (2015)], and Stanton and Murillo [Phys. Rev. E 91, 033104 (2015)]. Calculations including these potentials are performed with a new uniform relativistic self-consistent model electron photon processes in plasmas we developed. A comparison with the five sets of results obtained from our models in a uniform background (same density or temperature regions) is presented for the first time, and deviations among each other are shown. The present results not only provide valuable information regarding plasma effects but also reveal the applicability and the limitation of these models in some regimes and pave the way toward a deeper understanding of collective behavior for atoms or ions subjected to the plasma environments.