Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.15: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Quantum master equation approach for spectral line profiles in a plasma — •Chengliang Lin, Heidi Reinholz, and Gerd Röpke — Universität Rostock, Rostock, Deutschland

Within the framework of the theory of open quantum systems, the behavior of an atom in an interactive environment with particular attention to plasma surroundings is studied. A quantum master equation (QME) is derived to describe the dynamics of the atom in plasma. The contribution of the plasma environment to the QME is represented by its dynamic structure factor. For the application of the QME, the pressure broadening of spectral line profiles in a plasma is investigated. Of particular interest are the Rydberg states of the hydrogen atom. To describe the Rydberg states under the influence of a surrounding plasma, a wave packet description is introduced. The boundary between the quasi-classical and quantum mechanical representation of a bound electron is discussed. In addition, the transition rates between the bound wave packet states are calculated within this method. The resulting transition rates show a better agreement with the experimental data than the pure quantum mechanical calculation. For the further application, the inner-shell transitions (K-alpha line and Auger transition) are discussed by including both transverse and longitudinal component of the photon field as the heat bath of the investigated atom. A systematic approach to investigate the inner-shell transitions in a many-electron atom under the influence of the plasma environment is obtained.