Abstract

The resonance lines and other ground-term combinations of Ar ii have been measured in high orders of the NBS 10.7-m vacuum spectrograph. For one of the resonance lines, the wavelength 919.7810 ± 0.0002 Å was found, and for the interval between the resonance lines 12.2727 ± 0.0003₅ Å, which is 1.4 mÅ (0.17 cm⁻¹) larger than the previously reported value. The new results have been used to improve the 3s3p⁶ and 3p⁴nl levels in relation to the ground state and to derive 100 very accurate Ritz standards between 762 and 465 Å. The accuracy for many lines is ±0.0002 Å or better; the limits of error for others are ±0.0003 Å.

© 1971 Optical Society of America

Accurate Ground-Term Combinations in Ne i

Victor Kaufman and Lennart Minnhagen
J. Opt. Soc. Am. 62(1) 92-95 (1972)

Spectrum and the energy levels of neutral argon, Ar i

Lennart Minnhagen
J. Opt. Soc. Am. 63(10) 1185-1198 (1973)

First Spark Spectrum of Arsenic*

Hui Li and Kenneth L. Andrew
J. Opt. Soc. Am. 61(1) 96-109 (1971)

Measurement and Calculation of Cu II, Ge II, Si II, and C I Vacuum-Ultraviolet Lines

Victor Kaufman and John F. Ward
J. Opt. Soc. Am. 56(11) 1591-1597 (1966)

New Energy Levels of Doubly Ionized Manganese (Mn iii)

Stanley J. Yarosewick, James J. DaVia, and Frank L. Moore
J. Opt. Soc. Am. 61(6) 732-739 (1971)