ENERGY-LEVELS IN AR-II

The spectra of Cu, Mg, and V, produced by a hollow cathode with Ar and Ne as carrier gases, have been registered in the infrared region (180 0-9000 cm-1) with the Fourier-transform spectrometer at the National S olar Observatory on Kitt Peak. These spectra reveal the presence of th ree groups of lines around 1.8, 3.1, and 2.9 mum. Many of these emissi on lines have been identified as 3p4(P3)5f-6g, 5g-6h, 6g-7h, 6h-7i, an d 6f-7g transitions in ArII. From these observations, it has been poss ible to extend the term system of this ion and to determine the energi es of approximately 70 new levels. More precisely, the 3p4(P3)6h, 7h, and 7i configurations have been analyzed.