Atomic Model Files

Each atomic element in a SPECT3D calculation utilizes an atomic model file. Atomic model files have the default extension "*.atm".

Each atomic model file is associated with an ATBASE data file, which contains all the detailed collisional and radiative data required for the SPECT3D simulation. Atomic model and ATBASE data files contain data for a single atomic element.

Atomic model files contain information on which of the energy levels from ATBASE data files are selected for a simulation, and how they are collapsed (i.e., their degree of level splitting). Contents of each atomic model file include:

• The location (filepath) of the associated ATBASE atomic data file
• A list of levels in the ATBASE file, and a flag indicating whether or not to select each level for use in the SPECT3D simulation
• A list of superconfigurations into which ATBASE atomic levels are:
  • collapsed for the calculation of atomic level populations
  • collapsed for the calculation of spectra.
• Collapse model parameters for both the population and spectral portions of calculations. Parameters are written for each ion and base superconfiguration.

SPECT3D is distributed with ATBASE data files and series of preconfigured atomic model files.

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