Temperature Classification of the Stronger Lines of Columbium, with Preliminary Notes on Their Hyperfine Structure
Abstract
The paper gives the temperature ctass, the ionization, and a preliminary discussion of the hyperfine structure of 646 of the stronger lines of columbium between X 3100 and A 6900. The results were obtained by comparing electric-furnace spectra at tempera- tures of about 2500° and 29000 C with the spectra of the arc and spark. Approximately 200 lines appear in the furnace spectrum, but many neutral and all of the ionized lines require higher excitation. Much variation in response to excitation was found for lines in both groups: Of special interest is t/ze large proportion of columbium lines having /zyperfine structure. Of the lines listed, about 40 per cent are evidently complex. The patterns, for the most part unresolved, appear to consist usually of two, four, or six components, with some stifi more complex. As the wave-length increases, the spacing of hyperfine patterns becomes in general wider. Lines of complex structure occur in all temperature classes
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1931
- DOI:
- 10.1086/143289
- Bibcode:
- 1931ApJ....73...13K