Intensity vs. electron density of the ultraviolet M1 transition in Xe32+, Gd42+, W52+, Bi61+, and U70+ (Ti-like ions)

This work presents theoretical calculations of the intensity of the W lines arising from forbidden MI transitions within the ground configuration of h ighly ionized Ti-like ions. The intensity of these lines is calculated for different electron densities in the range 10(11)-10(16) cm(-3) and compared to lines arising from electric dipole allowed transitions between excited levels with J = 1 and the ground level (J = 0). The calculations show that the forbidden Mi transitions have a non-negligible intensity in densities t hat are of interest to tokamak machines. In particular, the intensity of th e near UV line arising from the M1 transition between the lowest J = 3 and J = 2 levels in the ground configuration, is found to be of the order of 1% of the strongest line emitted by the ion.