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Density Dependence of the Forbidden Lines Ni-Like Tungsten

Published

Author(s)

Yuri Ralchenko

Abstract

The magnetic-octupole (M3) and electric-quadrupole (E2) transitions between theground state $3d^{10}~^1S_0$ and the lowest excited $3d^94s$ $(5/2,1/2)$ J = 3and J = 2 states in the Ni-like tungsten are shown to exhibit a strongdependence on electron density $N_e$ in the range of values typical for tokamakplasmas. Remarkably, the total intensity of these overlapping lines remainsalmost constant, which may explain the strong emission in the 7.93~\AA~lineobserved in tokamak experiments (Neu R et al. 1997 \JPB {\bf 30} 5057).Utilization of the M3 and E2 line ratios for density diagnostics inhigh-spectral-resolution experiments is discussed as well.
Citation
Journal of Physics B-Atomic Molecular and Optical Physics
Volume
40
Issue
11

Keywords

forbidden lines, Ni-like tungsten, plasma diagnostics, tokamaks, x-ray spectra

Citation

Ralchenko, Y. (2007), Density Dependence of the Forbidden Lines Ni-Like Tungsten, Journal of Physics B-Atomic Molecular and Optical Physics, [online], https://doi.org/10.1088/0953-4075/40/11/F01 (Accessed April 15, 2024)
Created June 14, 2007, Updated November 10, 2018