Abstract
High- and medium-resolution ultraviolet spectra from the Space Telescope Imaging Spectrograph and the Goddard High Resolution Spectrograph were used to search for the weak electric quadrupole transitions of [Mg ii] near 1398.8 Å. This forbidden doublet was detected in eight sight lines. We calculate an empirical f-value of (1.29 ± 0.13) × 10−5 from all detections and discuss prospects of using this weak line in future studies of translucent interstellar clouds and in damped Lyα systems.
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