Effective collision strengths for transitions of Ni XVII

Claire Hudson, Patrick Norrington, Catherine Ramsbottom

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

Electron impact excitation collision strengths are required for the analysis and interpretation of stellar observations. This calculation aims to provide fine structure effective collision strengths for the Ni XVII ion using a method which includes contributions from resonances. A DARC calculation has been performed, involving 37 J pi states. The effective collision strengths are calculated by averaging the electron collision strengths over a Maxwellian distribution of electron velocities. The non-zero effective collision strengths for transitions between the fine structure levels are given for electron temperatures (T(e)) in the range log(10) T(e)(K) = 4.5 - 8.5. Data for several transitions from the ground state are discussed in this paper.

Original languageEnglish
Pages12060-12060
Number of pages4
DOIs
Publication statusPublished - Jan 2009
Event14th International Conference on the Physics of Highly Charged ions (HCI) - University Electro Commun, Chofu, Japan
Duration: 01 Jan 200901 Jan 2009

Conference

Conference14th International Conference on the Physics of Highly Charged ions (HCI)
CountryJapan
CityChofu
Period01/01/200901/01/2009

Keywords

  • ELECTRON-IMPACT EXCITATION
  • STRUCTURE CROSS-SECTIONS
  • REACTANCE MATRICES
  • PROGRAM
  • IONS

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