ADF04
Resolved specific ion data collections
| Code | Meaning | ' ' | unspecified electron impact excitation data | '1' | dipole electron impact excitation data | '2' | non-dipole, non-spin change electron impact excitation data | '3' | spin change electron impact excitation data | 'P' | positive ion impact excitation data | 'R' | free electron recombination/capture data | 'H' | charge exchange recombination data from neutral hydrogen | 'I' | electron impact ionisation data from stage below | 'S' | electron impact ionisation data to stage above | 'L' | unresolved dielectronic satellite line emission data |
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The data sets provide energy levels, and rate coefficient data for the ground and low levels of an ion up to some cut-off shell. The coefficient data includes, at minimum, spontaneous emission coefficients and electron impact collisional rates between the level set sufficient for a collisional–radiative population calculation and emissivity prediction.
The scope of the collisional–radiative calculation which the data set can support many be enhanced if it includes additional transition data for further processes. Transition lines in the ADF04 data set have a code letter which indicates the transition line type. The table below summarises these codes. An ADF04 data set with `R' and `S' lines can support a GCR population model and, with `H' lines, one which includes neutral hydrogen charge exchange driven recombination and emission. Users of ADF04 data sets should examine the comments section to see what is included. Sub-directories of the ADF04 format typical contain groups of files with similar capability covering iso-nuclear or iso-electronic sequences. There are very many ADF04 files and the appropriate one for a particular purpose should be chosen carefully. Note that ADF04 is a fundamental data format. It is the data formats ADF11, ADF13 and ADF15 produced after collisional–radiative calculations using an ADF04 data set which are most relevant to application.