Abstract
We present the ZEST code, dedicated to the calculation of line shapes broadened by Zeeman and Stark effects. As concerns the Stark effect, the model is based on the Standard Lineshape Theory in which ions are treated in the quasi-static approximation, whereas the effects of electrons are represented by weak collisions in the framework of a binary collision relaxation theory. A static magnetic field may be taken into account in the radiator Hamiltonian in the dipole approximation, which leads to additional Zeeman splitting patterns. Ion dynamics effects are implemented using the fast Frequency-Fluctuation Model. For fast calculations, the static ion microfield distribution in the plasma is evaluated using analytic fits of Monte-Carlo simulations, which depend only on the ion-ion coupling parameter and the electron-ion screening factor.
Highlights
Line shapes are key ingredients of opacity and emissivity codes, as they often serve as a diagnostics of laboratory or astrophysical plasmas
There is a close connection between line profiles, radiative transfer and the atomic populations which describe the microscopic states of the plasma [2]
Such a relationship is shown for instance by the escape factors formalism [3], which is often used in non-local-thermodynamical-equilibrium collisional-radiative models to account for opacity effects on the population of states
Summary
Line shapes are key ingredients of opacity and emissivity codes, as they often serve as a diagnostics of laboratory or astrophysical plasmas. Based on the fact that photons in the tail of lines can escape the plasma more than photons close to the center of lines, an effective reduction factor is introduced in the calculation of radiative transitions, which are used in the rate equations to obtain the population of states. These escape factors depend closely on line-shape profiles Iν , with integrals of.
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