Results 251 to 260 of about 197,703 (285)

The Effect of Degeneracy on the Scattering Contribution to the Radiative Opacity

Astrophysical Journal, 1995
The effect of partial free electron degeneracy on the scattering contribution to the radiative opacity is of interest in calculations of the structure and evolution of stars, particularly the Sun, where the plasma at the Sun's center is partially degenerate and scattering is a major contribution to the opacity.
exaly   +2 more sources

Calculations of the radiative opacity of laser-produced plasmas

Journal of Physics B: Atomic, Molecular and Optical Physics, 1992
The author presents a model for the calculation of the radiative opacity of high-power laser-produced plasmas in local thermodynamic equilibrium (LTE). The model uses detailed configuration accounting in an open shell for both the line and photoelectric absorption.
exaly   +2 more sources

Opacity Project data on CD for mean opacities and radiative accelerations

Monthly Notices of the Royal Astronomical Society: Letters, 2005
M J Seaton
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Calculation of the radiative opacity of laser-produced plasmas using a relativistic-screened hydrogenic model

Journal of Quantitative Spectroscopy and Radiative Transfer, 2004
n this work, we use a relativistic-screened hydrogenic model to compute the radiative opacity of laser-produced plasmas. The model is based on a set of screening charges which allow one to easily calculate atomic properties of isolated ions.
Ricardo Florido, Rafael Rodriguez, J M Gil   +2 more
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Radiation burnthrough measurements to infer opacity at conditions close to the solar radiative zone–convective zone boundary [PDF]

Physics of Plasmas, 2023
Recent measurements at the Sandia National Laboratory of the x-ray transmission of iron plasma have inferred opacities much higher than predicted by theory, which casts doubt on modeling of iron x-ray radiative opacity at conditions close to the solar ...
Theodore S. Perry, Bruce Remington, Robert Heeter   +2 more
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Calculation of radiative opacity of plasma mixtures using a relativistic screened hydrogenic model

Journal of Quantitative Spectroscopy and Radiative Transfer, 2014
We present the code ATMED based on an average atom model and conceived for fast computing the population distribution and radiative properties of hot and dense single and multicomponent plasmas under LTE conditions.
Ricardo Florido, Rafael Rodriguez, J M Gil   +2 more
exaly   +2 more sources

Radiative opacities for stellar envelopes

Physica Scripta, 1995
Recent advances in the field of opacity calculations for stellar envelopes are summarized. The methods used and the results obtained in the last decade by two independent groups are discussed briefly. Some of the important effects of the new data on astrophysical studies are outlined.
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On the influence of opacity variation on spatial structure of radiative shocks [PDF]

High Energy Density Physics, 2011
International audienceWe provide a theoretical analysis of Radiative Shocks, defined as supercritical shocks accompanied by an ionization wave in front of the density jump. In particular, we look at the influence of opacity variation with temperature and
Marcel Klapisch
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High-order multipole transitions in radiative opacities

Journal of Quantitative Spectroscopy and Radiative Transfer, 2006
Abstract The opacity code CASSANDRA, developed at AWE, has recently been modified to include all electric and magnetic multipole transitions of up to multipolarity L = 5 in both the bound–bound and bound–free spectra. It is found that the inclusion of these transitions increases the Rosseland mean opacity of moderate-Z elements by a few ...
L.M. Upcraft, J.W.O. Harris, B.J.B. Crowley   +2 more
openaire   +1 more source

Fast Calculation of the Radiative Opacity of Plasma

2011
Plasma opacity calculations play an important role in solar modelling and many plasma physics and inertial confinement fusion experiments. This thesis is focussed on the fast calculation of opacity from first principles. The existing average atom (AA) opacity code IMP [1] is used alongside experimental data and detailed atomic physics to develop new ...
openaire   +2 more sources