Hyperfeinstruktur, Stark-Effekt und Lebensdauern in den angeregten 5d6s6p y2D3/2,5/2 -Zuständen des Lanthan I-Spektrums/ Hyperfine Structure, Stark-Effect and Lifetimes of the Excited 5d6s6p y 2D3/2,5/2-States of the Lanthanum I Spectrum

Abstract

The levelcrossing method has been used for an investigation of the hyperfine structure and lifetimes in the excited 5d6s6p y 2D3/2, 5/2-states of Lanthanum I. From a detailed analysis of the measured change in intensity of the resonance light the following hyperfine interaction constants and lifetimes were deduced:Applying an additional homogeneous electric field parallel to the usual magnetic field the constants β of the quadratic Stark effect in the y 2D-states were derived from the observed shifts of the levelcrossing signals:The experimental results are interpreted theoretically by the concept of intermediate coupling using appropriate eigenvectors. The observed lifetimes and the β-values are compared with the Bates and Damgaard approximation.