Opened 4 years ago

#277 new enhancement

collisional ionization rate coefficients

Reported by: Gary J. Ferland Owned by: nobody
Priority: good to do Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:


Electron-impact Ionization of P-like Ions Forming Si-like Ions
Kwon, D.-H.; Savin, D. W.
AA(Nuclear Data Center, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea, AB(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA)
The Astrophysical Journal, Volume 784, Issue 1, article id. 13, 7 pp. (2014). (ApJ Homepage)
Publication Date:	
Astronomy Keywords:	
atomic data, atomic processes
Bibliographic Code:	

We have calculated electron-impact ionization (EII) for P-like systems from P to 
Zn15 + forming Si-like ions. The work was performed using the flexible atomic 
code (FAC) which is based on a distorted-wave approximation. All 3l ? nl' (n = 3-
35) excitation-autoionization (EA) channels near the 3p direct ionization threshold 
and 2l ? nl' (n = 3-10) EA channels at the higher energies are included. Close 
attention has been paid to the detailed branching ratios. Our calculated total EII 
cross sections are compared both with previous FAC calculations, which omitted 
many of these EA channels, and with the available experimental results. Moreover,
for Fe11 +, we find that part of the remaining discrepancies between our 
calculations and recent measurements can be accounted for by the inclusion of the
resonant excitation double autoionization process. Lastly, at the temperatures 
where each ion is predicted to peak in abundances in collisional ionization 
equilibrium, the Maxwellian rate coefficients derived from our calculations differ by
50%-7% from the previous FAC rate coefficients, with the difference decreasing with
increasing charge.

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