Ion broadening of dense-plasma spectral lines including field-dependent atomic physics and the ion quadrupole interaction

Abstract

We examine the theoretical line spectra from hydrogenlike argon in the electron-number-density range of 10 -10 cm and at a temperature corresponding to kT=800 eV. At these high densities it is important to address the relevance of higher-order plasma-ion microfield efFects on the spectral line shape. We begin by calculating spectral line shapes using electric-field-dependent matrix elements that are constructed from wave functions which are solutions of Schrodinger's equation for hydrogenic ions in a uniform field. This provides a suitable basis for including microfield spatial nonuniformities by considering the quadrupole term in the radiator-perturbing ion interaction. Field gradients are calculated in an approximation that takes ion-ion correlations into account. We examine the consequences of these effects as well as of mixing between the adjacent Stark manifold on the Lyman-a and Lyman-P lines of hydrogenlike argon. PACS number(s): 52.25.Nr, 32.70.Jz, 32.30.Rj (APEX) model of the plasma-ion microfield [15,16] thus also incorporating correlations among perturbing ions. This represents an improvement with respect to a previous treatment that only included correlations between the radiator and perturbing ions [6].The power emitted by dipole radiation from an emitter immersed in a plasma, as a function of the frequency, is given by [1,17]

Quantum-number–dependent energy level shifts of ions in dense plasmas: A generalized analytical approach

“…-Energy level shifts of ions in dense plasmas have been found experimentally and theoretically for many decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The reason for this phenomenon is related to the fact that the plasma shields the nuclear attraction of the bound electron that in turn shifts the energy level toward the continuum.…”

On Stark broadening as a tool for diagnostics of high density plasmas

“…1! has to be included in the calculation of the line profile, which means that SB entangles with kinetics~Anufrienko et al, 1993;Kosarev et al, 1997!, in contrast to the usual assumption of a diagonal density matrix in SB~Griem, 1974!. These phenomena are known in laser physics as the nonlinear interference effects~NIEF!~Rautian & Shalagin, 1991!.…”

Contribution to Calculation of Ion Microfield Nonuniformity Effect on the Asymmetry of Lyman‐α Line in Dense Plasma

“…Of course, these averages concern the ion microfield itself as well as its partial spatial derivatives in the final expression of the intensity. Indeed, one of our interest in this work is the evaluation of different distribution functions as we are intending to examine the ion quadrupole effects which are indispensable when dealing with high temperatures and high densities plasmas [40,41]. The including of this effect as a perturbation in the spectral broadening theory is done by using the standard multipole expansion [40].…”

“…Indeed, one of our interest in this work is the evaluation of different distribution functions as we are intending to examine the ion quadrupole effects which are indispensable when dealing with high temperatures and high densities plasmas [40,41]. The including of this effect as a perturbation in the spectral broadening theory is done by using the standard multipole expansion [40]. The ions-emitter Hamiltonian in the first order of the nonuniformity is given by [39]:…”

“…However ion microfield nonuniformity effect due to electric field gradients must be taken into account for some radiative transitions and some physical conditions. The theoretical spectral line shape formulation including the ion quadrupole effect is presented by [40]:…”