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The effect of plasma perturbers on ionic systems inside a plasma is complex, time-dependent, and stochastic. It affects not only the population of the various excited and charge states of the ions, but also the life time of these states. The broadening and population of the states inside plasmas must be treated simultaneously in a coherent way. The purpose of this project was to develop a systematic theoretical procedure to treat the effects of plasma perturbers on the atomic reaction rates, in a way consistent with the rate equation approach to plasma modeling. As explained in the following, we have completed the program set out originally. Further works needed are also pointed out. We first formulated a theoretical procedure to treat this problem in a simple form such that the theory may be applied to realistic cases. The crucial features of the conventional approaches for plasma modeling and diagnostics, the pressure broadening theory (PBT) and the rate equations approach (REQ), are adopted in treating the level distortions and population determination. The PBT is effective in treating the distortion, while the REQ approach is suitable in treating multiple cascade effects on the level population. In order to combine both these theories, however, careful examination of the assumptions which have gone into the PBT and REQ formulations had to be carried out, in terms of the distorted state dressing and coarse grain averaging. The various relaxation times involved in the perturber collisions, ionic decay, and averaging time intervals were compared. The resulting theory separates the plasma perturbations into two parts, slow and fast relative to the typical atomic relaxation time involved for a particular state of the target ion. The slow part is to be included in an effective plasma potential, and is to be used in distorting the ionic states

Quantum plasma dynamics: Distorted atomic reaction rates for high temperature plasmas. Final report, September 15, 1991--September 14, 1994