Argon I Lines Produced in a Hollow Cathode Source, 332 nm to 5865 nm.

We report precision measurements by Fourier transform spectroscopy of the vacuum wavenumber, line width, and relative signal strength of 928 lines in the Ar I spectrum. Wavelength in air and classification of the transition are supplied for each line. A comparison of our results with other precision measurements illustrates the sensitivity of Ar I wavelengths to conditions in the light source.

Improved Wavelengths and Energy Levels of Doubly-Ionized Argon (Ar III).

New measurements of Ar III wavelengths between 508 Å and 4183 Å are combined with measurements from the literature to find improved values for the energy of most of the known levels in Ar III. Parameters derived from fitting the new level energies to an -coupling model are presented along with eigenvector compositions of the levels. On the basis of this analysis new designations are recommended for several levels.