![]() ![]() 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 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 more ยป 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. The determination of level populations and detailed population mechanisms in dense plasmas has become an increasingly important problem in atomic physics. ![]()
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