Atomic and Molecular Diagnostic Processes in Plasmas



Fits for Total Dielectronic Recombination Rate Coefficients

(Partial final-state resolved rate coefficients from initial ground and metastable states are also available.)

αDR(T )=T -3/2 Σi ci exp (-Ei /T ),

where Ei are in the units of Temperature (eV or K) and the αDR(T ) rate coefficient is in units of cm3 s-1.
(The units of ci are then cm3 s-1 *[eV or K] 3/2.)

The fitting coefficients are tabulated by element Z (where Z is the nuclear charge), isoelectronic sequence N (where N=1,2 ... is the number of electrons of the initial target ion) and initial metastable levels M (where M=1 for the ground level etc.) of the ground and metastable terms. Results are available for all elements from He to Zn, plus Kr, Mo and Xe, for all sequences up to Al-like. Other elements may be added on request. Here is a nice table, in Kelvin or eV, for those of you who just want the fit coefficients. (Hint, the ci constitute the top half of the table, the Ei the bottom - scroll down and all is revealed.)

Complete fit coefficient table, in Kelvin or eV.

Further information, upon which this table was generated, is also available viz. in addition to the fit coefficients, the original temperature tabulated total DR rate coefficients obtained from the archived adf09 files, the result of the fit and the fractional difference. This is contained in a single (arbitrarily ordered by Z, N and M) master file, available in Kelvin or eV (gzipped). The tabulated temperatures are the ADAS standard viz. (101 - 107)*z 2 K ***, where z is the residual charge of the electron target. Finally, the table itself was produced by this Fortran program from the master file, i.e. if you adjust the Fortran format statements you can easily format output as you please.

Partial Dielectronic Recombination Rate Coefficients

Final-state resolved partial DR rate coefficients for ground and metastable initial states are archived according to the ADAS (Atomic Data and Analysis Structure) adf09 file format. Data are available in both LS- and intermediate- coupling. Here is the key to decoding the adf09 files names.

H-like (individual) ion files, or sequence tar file.
He-like (individual) ion files, or sequence tar file.
Li-like (individual) ion files, or sequence tar file.
Be-like (individual) ion files, or sequence tar file.
B-like (individual) ion files, or sequence tar file.
C-like (individual) ion files, or sequence tar file.
N-like (individual) ion files, or sequence tar file.
O-like (individual) ion files, or sequence tar file.
F-like (individual) ion files, or sequence tar file.
Ne-like (individual) ion files, or sequence tar file.
Na-like (individual) ion files, or sequence tar file.
Mg-like (individual) ion files, or sequence tar file.
Al-like (individual) ion files, or sequence tar file.
Si-like (individual) ion files, or sequence tar file.
P-like (individual)ion files, or sequence tar file.

All files are gzipped.

Publications.

*** At temperatures above about 108K the relativistic deviation from the non-relativistic Maxwellian electron energy distribution should be factored-in. The contribution of inner- (especially K-) shell transitions should be considered also at very high temperatures.

If you have any comments or queries please e-mail badnell@phys.strath.ac.uk.

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