Extension of the first spectrum of rhodium (RhI)

Abstract

The arc spectrum of rhodium has been investigated photographically in the region 6300 to 12000 A. The spectrum was excited in conventional direct-current arcs and photographed on infrared sensitive emulsions with the aid of concave diffraction gratings. Wavelengths have been measured for 238 Rh T lines, including 90 new lines, of which 53 have been classified. Two new even levels have been added to the list of known term values; these two new levels account for 18 of the 53 newly classified Rh i lines.