The First Spectrum of Mercury in the Region between 13 and 20μ*

Abstract

The spectrum of neutral mercury has been observed in the region between 1 and 2.0µ, with a high-resolution grating spectrometer employing a lead sulfide detector. A noteworthy feature of the new observations is the essentially complete resolution of the D-F multiplets involving both first and second members of F series. Such resolution was achieved only with a low-pressure source. All new lines have been classified. A few changes in existing classifications and minor revisions in term values are suggested.