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Hot dense plasma shielding effect on the properties of atoms

Author: LiYongQiang
Tutor: YuanJianMin
School: National University of Defense Science and Technology
Course: Physics
Keywords: Plasma screening Transition level Oscillator strength Ionization energy Beryllium
CLC: O531
Type: Master's thesis
Year: 2007
Downloads: 47
Quote: 0
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Abstract


The use of plasma screening effects include configuration interaction theory hot dense plasma environment of the ion energy level structure and radiation properties. The development of freedom of research atomic configuration interaction method, and a detailed discussion of hot dense plasma at different temperatures, densities shielding effect on the atomic structure and properties of transition, get a lot of highly ionized ions of the basic parameters, including atomic energy levels, oscillator strengths and ionization energies. This work is the first to introduce the three basic models, namely Debye model, particle sphere model and self-consistent field model. These three models are based ensemble theory. Which, Debye model and particle research sphere model is that people often use the plasma shielding effect model; while the self-consistent field model is a combination of particle-sphere model, the average atom model and configuration interaction theory puts forward a study of plasma effect new model. By combining these three models and configuration interaction theory, we calculated a series of basic atomic parameters, focused on the free electron temperature is 100eV to 2000eV, free electron density at 10 22 cm < sup> -3 to 10 24 cm -3 within the scope of the shielding effect of the plasma on the Class Z Be ion energy level transitions, oscillator strengths and ionization able to influence. The results show that the basic parameters of atoms temperature and density of the plasma is sensitive to plasma effect that class Be ion resonance line 2s 2 - [2s 1/2 , 2p 1/2 ] 1 and cross combination line 2s 2 - [2s 1/2 , 2p 3/2 ] 1 transition excitation energy increases, resulting in blue shift of spectral lines, and with the shielding effect of the growing, blue shift will gradually increase the degree of Large: shielding effect for 2s 2 - [2s 1/2 , 2p (1/2)] 1 and 2s 2 < / sup> - [2s 1/2 , 2p 3/2 ] 1 transition oscillator strength has a similar effect; since the plasma environment The pressure caused by the ionizing effect, the various ions in the plasma environment, the ionization energy decreases, and increases as the density of free electrons or free electron temperature decrease, the decrease in ionization energy increases.

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