Some f-values for transitions in Zr II, Zr III and Sr I (with astrophysical implications)

• Published in: Astrophysics and space science Vol. 58; no. 2; pp. 365 - 369
• Main Authors: Malloy, P J, Czyzak, S J
• Format: Journal Article
• Language: English
• Published: 01.10.1978
• ISSN: 0004-640X
• DOI: 10.1007/BF00644523

Transition probabilities are calculated for 13 allowed transitions of astrophysical interest in Zr II, Zr III, and Sr I. In determining the f-values, the Hartree-Fock wave functions are computed by the methods developed by Mayers and O'Brien (1969) as well as by Froese-Fisher (1977). The wave functions are used to determine the dipole velocity and dipole length, which are compared to evaluate the significance of the differences. It is found that: (1) there are sizable differences between the respective f-values based on dipole length and dipole velocity for Sr I and Zr III; (2) the f-values based on dipole velocity for Sr I agree reasonably well with the experimentally determined f-value; and (3) the two f-values for Zr II differ anywhere from approximately 2% to 20%. Possible reasons for the differences are considered.