In laser produced plasmas this can be done via holographic interferometry for electron density determinations and via the slope of the H-like free-bound continuum of K-shell lines for electron temperature determinations. In order to be useful these dependencies must be characterized by independent means. Both can be used to extract information concerning population kinetics and ion level populations. Certain spectral line intensity ratios are density-dependent while others are temperature-dependent.
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« lessĭetailed atomic level populations in high temperature and dense plasmas have become increasingly important in laser generated plasmas. of California, Davis Country of Publication: United States Language: English Subject: 74 ATOMIC AND MOLECULAR PHYSICS 70 PLASMA PHYSICS AND FUSION TECHNOLOGY ALUMINIUM IONS TRANSITION RADIATION LASER-PRODUCED PLASMA X-RAY SPECTROSCOPY MOLYBDENUM IONS SILVER IONS ELECTRON DENSITY ELECTRON TEMPERATURE ELECTRON-ION COLLISIONS EMISSION SPECTRA IONIZATION K SHELL L SHELL PLASMA DIAGNOSTICS SPATIAL RESOLUTION TEMPERATURE DEPENDENCE TIME RESOLUTION CHARGED PARTICLES COLLISIONS ELECTROMAGNETIC RADIATION ELECTRON COLLISIONS ELECTRONIC STRUCTURE ION COLLISIONS IONS PLASMA RADIATIONS RESOLUTION SPECTRA SPECTROSCOPY TIMING PROPERTIES 640302* - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory 640304 - Atomic, Molecular & Chemical Physics- Collision Phenomena 700101 - Fusion Energy- Plasma Research- Confinement, Heating, & = lpha emission lines. Portions of this document are illegible in microfiche products. « lessĪuthors: Young, Bruce Kai Fong Publication Date: Thu Sep 01 00:00: Research Org.: Lawrence Livermore National Lab., CA (USA) OSTI Identifier: 6682739 Report Number(s): UCRL-53887 ON: DE89002928 DOE Contract Number: W-7405-ENG-48 Resource Type: Technical Report Resource Relation: Other Information: Thesis (Ph.D.). beta./'' helium-like resonance line intensity ratios. This same recombining plasma calculation successfully models the density dependence of the high-n ''He/sub. Instead, a quasi-steady state atomic model based on a purely recombining plasma is shown to accurately predict the measured density dependence. Standard collisional radiative equilibrium models fail to account for the observed density dependence measured for the ''He/sub. In aluminum, the electron density dependence of more » various helium-like line intensity ratios were measured. Thus, the density dependence of K-shell spectral lines could be clearly examined, independent of assumptions concerning the dynamics of the plasma. The time resolved electron density profiles were measured using multiple frame holographic interferometry. The plasma temperatures were determined from the slope of the hydrogen-like recombination continuum. This has been achieved through the combined use of new diagnostic instruments and microdot targets which provided simultaneously space, time, and spectrally resolved data. The laser-plasmas had to be fully characterized in order to clearly compare the observed density dependence with atomic theory predictions. The density dependent line intensities vary greatly in laser-produced plasmas and can be used to extract detailed information concerning the population kinetics and level populations of the ions. For each case, the density dependence of the observed line emission is due to the effect of high frequency electron-ion collisions on metastable levels. In this work, the density variation of line intensities and level populations in aluminum K-shell and molybdenum and silver L-shell emission spectra have been measured from high-powered, laser-produced plasmas.
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The determination of level populations and detailed population mechanisms in dense plasmas has become an increasingly important problem in atomic physics.