Suppression of fine-structure splitting and oscillator strength of sodium D-line in a Debye plasma

Abstract

We investigate theoretically the influence of static plasma screening on relativistic spin-orbit interaction-induced fine-structure splitting of the D-line doublet arising from the transitions 3p 1/2 -3s 1/2 and 3p 3/2 -3s 1/2 of the valence electron of a sodium atom embedded in a model plasma environment. The many-electron atomic problem is formulated first as an effective one-electron problem in which the interaction between the optically active valence electron and the atomic ion core is represented by an accurate parametric model potential including core-polarization correction, and then the plasma effect on the atomic system is simulated by the Debye-screening model for the valence-core interaction. It is observed that the magnitude of spin-orbit energy shift reduces for both the upper component 3p 3/2 and the lower component 3p 1/2 with increasing plasma screening strength, thereby reducing the spin-orbit energy separation between these two components as the screening becomes stronger. As a consequence, the magnitude of fine-structure splitting between the D 1 and D 2 line energies of sodium drops significantly with stronger plasma screening. The optical (absorption) oscillator strength for 3s ! 3p transition is seen to reduce with stronger screening and this leads to a screening-induced gradual suppression of the 3p ! 3s spontaneous decay rate. V C 2014 AIP Publishing LLC. [http://dx.

Transitional Strength Under Plasma: Precise Estimations of Astrophysically Relevant Electromagnetic Transitions of Ar7, Kr7, Xe7, and Rn7 Under Plasma Atmosphere++++

“…for µ = 0, 0.025, 0.05, and 0.075 a.u., respectively. This phenomenon is consistent with earlier calculations for sodium D line [127] and hydrogen-like atoms [128]. The suppression of the transition rate among the fine-structure levels is mainly arising from the energy quench.…”

Non-resonant elastic scattering of low-energy photons by atomic sodium confined in quantum plasmas

“…atoms are injected for diagnostics of fusion edge plasmas 9,10 and extreme ultraviolet radiation from laser-produced alkali plasmas are important for surface morphology applications. 11 Recent years have seen a number of theoretical studies [12][13][14][15][16][17][18] pertaining to the photoionization and the radiative recombination processes, the multipole polarizabilities, and the electronic structures and transition properties of alkali atoms confined in WCPs. It is well-known that the elastic scattering of photons 19,20 by the bound electron(s) of atoms and molecules is one of the fundamental modes of interaction between electromagnetic radiation and matter.…”