Collisional excitation rate coefficients for Fe XI

Astronomy and Astrophysics – Astrophysics

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Atomic Excitations, Collision Rates, Electron Scattering, High Temperature Plasmas, Iron, Metallic Plasmas, Plasma Spectra, Space Plasmas, Transition Probabilities, Zeta Pinch

Scientific paper

It is pointed out that electron collisional rate coefficients for iron ions are important atomic data for studies of both laboratory and astrophysical plasmas. Datla et al. (1975) have measured the ionization and relative excitation rate coefficients for Fe VIII, Fe IX, and Fe X. The present investigation is concerned with the relative excitation rate coefficients for Fe XI. Absolute intensities of VUV transitions 3s2 3p3 3d-3s2 3p4, 3s 3p5-3s2 3p4, and 3s2 3p3 4s-3s2 3p4 in Fe XI are measured and interpreted in terms of excitation rate coefficients. Data regarding the Fe XI line intensities and plasma parameters, and the relative excitation rate coefficients for Fe XI are provided in tables.

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