We report on the first interstellar detections of transitions of the heavy elements As II and Se II along with 2 σ upper limits for Te II and Pb II. We also present a line list of the strongest ultraviolet transitions for an additional eight heavy elements, including rest wavelengths and a compilation of existing transition oscillator strengths along with new theoretical values for many species. All these transitions fall within the accessible UV range of the Goddard High Resolution Spectrograph. With two exceptions, all these elements are characterized by relatively low condensation temperatures (T c ≤720 K) and are therefore expected to be only lightly depleted onto dust
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Cardelli et al. (1993) studied this question.