Low Noise Solar and Laboratory Spectroscopy--IV: A Technique for Relative Oscillator Strength Measurements with Application to FE II

Abstract

A King furnace absorption source is described for use with the Oxford spectrometer in relative oscillator strength measurement. Experiments on lines of Fe I indicate that high inert gas pressures in the source combined with direct integrations of very faint line profiles can increase the precision of relative oscillator strength measurement by this method and enable its use to be extended to lines of higher excitation potential than has hitherto proved possible.