Abstract
Using the low-energy electron beam ion trap EBIT-II at the Lawrence Livermore National Laboratory, we surveyed neon and argon spectra throughout the wavelength range from 3800 to 6000 Å employing a prism spectrograph and a scientific-grade CCD camera. By varying the electron beam energy, spectra from singly ionized to highly ionized neon and argon ions were recorded. In total, about 130 lines were observed from ions in low charge states. About half of the lines have not been reported before. From high charge state ions, several lines of forbidden transitions were observed, among which are the prominent M1 transitions from Ar XIV at 4412 Å and Ar X at 5534 Å.
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