Breit-Pauli R-matrix calculation of fine-structure effective collision strengths for the electron impact excitation of Mg V

Details Breit-Pauli R-matrix calculation of fine-structure effective collision strengths for the electron impact excitation of Mg V Breit-Pauli R-matrix calculation of fine-structure effective collision strengths for the electron impact excitation of Mg V

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...494..729h&link_type=abstract

Astronomy and Astrophysics, Volume 494, Issue 2, 2009, pp.729-737

Astronomy and Astrophysics

Astrophysics

1

Atomic Processes, Line: Formation, Methods: Analytical

Scientific paper

Context: Electron-impact excitation collision strengths are required for the analysis and interpretation of stellar observations. Aims: This calculation aims to provide effective collision strengths for the Mg V ion for a larger number of transitions and for a greater temperature range than previously available, using collision strength data that include contributions from resonances. Methods: A 19-state Breit-Pauli R-matrix calculation was performed. The target states are represented by configuration interaction wavefunctions and consist of the 19 lowest LS states, having configurations 2s^22p^4, 2s2p^5, 2p^6, 2s^22p^33s, and 2s^22p^33p. These target states give rise to 37 fine-structure levels and 666 possible transitions. The effective collision strengths were calculated by averaging the electron collision strengths over a Maxwellian distribution of electron velocities. Results: The non-zero effective collision strengths for transitions between the fine-structure levels are given for electron temperatures (T_e) in the range log10 Te (K) = 3.0 - 7.0. Data for transitions among the 5 fine-structure levels arising from the 2s^22p4 ground state configurations, seen in the UV range, are discussed in the paper, along with transitions in the EUV range - transitions from the ground state ^3P levels to 2s2p5 ^3Po levels. The 2s^22p4 ^1D-2s2p5 ^1Po transition is also noted. Data for the remaining transitions are available at the CDS.
Table 8 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?J/A+A/494/729

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