SHIFT OF EMISSION LINES OF CR AND NI PRODUCED BY ARGON AND HELIUM

The shifts of all strong emission lines of neutral Cr and Ni in the wavelenght ranges of 3014-5328 Å, and 3050-3619 Å, respectively, with argon and of 3017-4651 Å and 3369-3619 Å, respectively, with helium have been measured. The temperatures and the relative densities (r.d.) of the gases at which observations were made are, respectively, 3230°K and 28-104 for Ar and 3600°K and 60-108 for He. The shift vs. r.d. relationship for 14 CrI lines and 11 NiI lines with argon, and 12 Cr lines and a single Ni line with helium, are tabulated. Some lines show a linear dependence of shift on r.d. and some behave linearly for low r.d. but quadratically for higher r.d. The general statements about the behavior of the relative shifts of spectral levels with respect to L and S values are the same as those for the FeI lines. The normal fine-structure levels (many multiplets of CrI) behave in their relative shifts oppositely to those of inverted levels (FeI), although the behavior depends on the more detailed structure of the levels. © 1969.