Physica A: Statistical Mechanics and its Applications
Correlated fluctuations of electron populations in high temperature plasmas
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Free-free opacity in dense plasmas with an average atom model
2017, High Energy Density PhysicsCitation Excerpt :Since our main aim is to model the free-free opacity we tolerate these weaknesses at present. Others have used average atom models to calculate opacity in the dense plasma regime (for example [6,25–28]). These methods have variously accounted for different configurations, and corrected the DFT energies using the usual trick [24].
RESEOS - A model of thermodynamic and optical properties of hot and warm dense matter
2014, High Energy Density PhysicsCitation Excerpt :Finally, to provide smooth ρ, T-dependencies of optical properties at high densities, one needs to account for the effect of the occupation-number fluctuations of average-atom continuum states on the effective widths of spectral features and the spread of photoionization thresholds [23,60]. These fluctuations should also be accounted for in the expressions both for the configuration average energy (31) and statistical weight (21) [52]. Accounting for resonances represented by sharp peaks of the continuum-electron DOS enables one to provide correct description of thermodynamic properties of the pressure-ionized materials in the framework of Liberman's model [25].
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2013, High Energy Density PhysicsCitation Excerpt :This simplified model can be used to perform fast, approximate DCA calculations. It was also shown that the Gaussian approximation of Ref. [17] can be applied to construct a statistical approach to the DCA calculation. To apply this formalism required the approximation of the expression for the simplified configuration free-energy by its second-order expansion in the occupation numbers.
A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
2011, High Energy Density PhysicsCitation Excerpt :SCO is a superconfiguration opacity code based on a physical model that gives a reliable description of plasma physics over a wide range of temperature, density and atomic number. A special feature of SCO is the automatic selection of configurations and superconfigurations, starting from an average atom model and using fluctuation theory [8,9]. Atomic structure is computed using a self-consistent approach within central-field approximation, and density effects like free-electron screening are taken into account by the code.
Nuclear excitation by electronic processes: NEEC and NEET effects
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