Atomic data from the Iron Project. XXVII. Electron impact excitation collision strengths and rate coefficients for Fe IV
Abstract
Collision strengths and maxwellian-averaged rate coefficients have been calculated for 8771 non-vanishing transitions among 140 fine structure levels, dominated by the configurations 3d^5, 3d^44s, and 3d^44p in Fe IV. Collision strengths are calculated using the R-matrix method with a 49 term close-coupling target expansion for electron energies up to 15 rydbergs. Rate coefficients are tabulated for a wide range of temperatures in which Fe IV is abundant in plasma sources. A brief discussion of the calculations and sample results are given. The present rates for Fe IV are expected to find applications in spectral diagnostics of a variety of astrophysical sources. Table 3 for complete data for Fe IV is only available in electronic form at the CDS via anonymous to ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- December 1997
- Bibcode:
- 1997A&AS..126..373Z
- Keywords:
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- ATOMIC PROCESSES;
- PLANETARY NEBULAE: GENERAL;
- H II REGIONS