Los Alamos LEDCOP Opacity Code

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7265890

Magee, Jr, N H; Merts, A L

The Los Alamos Light Element (Z {le} 30) Detailed Configuration Opacity Code (LEDCOP), used to calculate opacities in local thermodynamic equilibrium (LTE), has been rewritten to incorporate more detailed atomic physics input. This paper outlines the recent improvements in the code that will provide new Rosseland opacities and, more importantly, better group mean opacities for modern radiation-hydrodynamic codes. The first major area of improvement is the inclusion of a complete set of accurate and internally-consistent Hartree-Fock LS term energies and oscillator strengths for each element. While relatively unimportant for equation of state (EOS), this does provide an improved distribution of line energies and strengths for group mean opacities. Secondly, the code now used Hartree-Fock photoionization cross sections for all ground and excited configurations of all ionization stages. These new cross sections are consistent with the bound-bound oscillator strengths and in many cases their inclusion affects the opacity more than the new LS oscillator strengths. 11 refs., 16 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOD
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7265890
• Report Number(s): LA-UR-90-176; CONF-8908210--1; ON: DE90008636
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
360603 -- Materials-- Properties
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
COMPUTER CALCULATIONS
COMPUTER CODES
COUPLING
CROSS SECTIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EQUILIBRIUM
HARTREE-FOCK METHOD
INTERMEDIATE COUPLING
IONIZATION
IRON
L CODES
L-S COUPLING
METALS
NONMETALS
OPACITY
OPTICAL PROPERTIES
OSCILLATOR STRENGTHS
OXYGEN
PHOTOIONIZATION
PHYSICAL PROPERTIES
THERMAL EQUILIBRIUM
TRANSITION ELEMENTS