Vol. 41, Issue 4, pp. 971-978

Abstract

Atomic structure data and effective collision strengths for 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ and 54 fine-structure levels contained in the configurations 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ 4l (l = s, p, d, f) for the nickel-like La ion have been investigated. These data are used in the determination of the reduced population for the 55 fine structure levels over a wide range of electron densities (from 10²⁰ to 10²²) and at various electron plasma temperatures. The gain coefficients for those transitions with positive population inversion factor are determined and plotted against the electron density.