Plasma Stark effect of He ii Paschen- α : Resolution of the disagreement between experiment and theory

The Fingerprints of Periodic Electric Fields on Line Shapes Emitted in Plasmas

“…This approximation requires that the plasma particles stay far away from the emitter, a condition which is not always satisfied, e.g., in high-density plasmas. Several studies taking into account a full Coulomb interaction and considering perturbers penetrating the bound electron wave function have demonstrated how the line shapes can be modified in high-density plasmas [9,15,16]. Here we assume that we can use a dipole approximation, and we express the Debye screened electric field created by the ith ion by the expression:…”

“…The problem with most of the line shape calculations is that they are based on numerous approximations since Stark broadening is a complex problem involving plasma and quantum physics. We study here only hydrogen atoms, for which approximations such as neglecting the Stark effect between states with a principal quantum number n other than those of the radiating transition, or the use of a dipole interaction, can be the source of inaccuracy on the line shape for dense plasma conditions [9]. For weakly coupled plasmas considered in the following, one often has to Atoms 2023, 11, 128 2 of 10 retain ion dynamics together with the oscillating electric field for obtaining an accurate line shape.…”

Investigating Mechanisms of State Localization in Highly-Ionized Dense Plasmas

“…PPS arises due to the surrounding plasma particles perturbing the wavefunctions of an ion's orbitals, with the perturbation increasing with the principle quantum number of an orbital [69]. Experimental evidence of PPS for a number of elements and plasma densities [69][70][71][72][73][74][75] indicates it redshifts transition lines. In other words, the binding energy of outer orbitals increases more relative to inner orbitals.…”