Oscillator Strengths of Ultraviolet fe i Lines from Hook-Method Measurements on a Furnace

Abstract

The hook method, which makes use of anomalous dispersion, was employed to measure 107 absolute oscillator strengths of Fe I on a high-temperature furnace. The absolute scale was established before and after each run by recording the anomalous dispersion near a strong resonance line with accurately known f-value. The results cover three lines with wavelengths 1934-1941 A, and 104 lines lying between 2084 and 3194 A-mostly transitions originating from the a 5D ground state. The average error of the f-values is I 20 percent, and the largest and smallest errors given are I 10 and I 60 percent. We find disagreements, exceeding an order of magnitude, with previous values in the literature. Subject headings: spectra, laboratory - spectra, ultraviolet - transition probabilities