Electron-impact excitation of Fe II. Collision strengths and effective collision strengths for low-lying fine-structure forbidden transitions

Details Electron-impact excitation of Fe II. Collision strengths and effective collision strengths for low-lying fine-structure forbidden transitions Electron-impact excitation of Fe II. Collision strengths and effective collision strengths for low-lying fine-structure forbidden transitions

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...475..765r&link_type=abstract

Astronomy and Astrophysics, Volume 475, Issue 2, November IV 2007, pp.765-769

Astronomy and Astrophysics

Astrophysics

14

Atomic Data, Atomic Processes, Plasmas

Scientific paper

Context: Absorption or emission lines of Fe II are observed in many astrophysical spectra and accurate atomic data are required to interpret these lines. The calculation of electron-impact excitation rates for transitions among even the lowest lying levels of Fe II is a formidable task for theoreticians. Aims: In this paper, we present collision strengths and effective collision strengths for electron-impact excitation of Fe II for low-lying forbidden transitions among the lowest 16 fine-structure levels arising from the four LS states 3d64s 6De, 3d7 4Fe, 3d64s 4De, and 3d7 4Pe. The effective collision strengths are calculated for a wide range of electron temperatures of astrophysical importance from 30-100 000 K. Methods: The parallel suite of Breit-Pauli codes are utilised to compute the collision cross sections for electron-impact excitation of Fe II and relativistic terms are included explicitly in both the target and the scattering approximation. 100 LS or 262-jj levels formed from the basis configurations 3d64s, 3d7, and 3d64p were included in the wavefunction representation of the target, including all doublet, quartet, and sextet terms. Collision strengths for a total of 34 191 individual transitions were computed. Results: A detailed comparison is made with previous theoretical works and significant differences were found to occur in the effective collision strengths, particularly at low temperatures.
Table 3 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?/A+A/475/765

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