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The level-crossing-method has been used for an investigation of the hyperfine structure of the first excited 3  2 P 3/2 -state of sodium applying an additional electric field parallel to the usual mag. netic field. By means of a detailed analysis of the measured change in intensity of the scattered fluorescence light due to the electric field the constant β of the quadratic Stark-effect of the 3  2 P 3/2 -state of sodium was deduced to be β= (10.8± 1.2) kc/s·(kV/cm) 2 . The experimental result will be discussed with respect to a determination of upper and lower limits for oscillator strengths of transitions between the 3  2 P 3/2 -state and S-states in the sodium spectrum.

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Stark-Effekt-Untersuchung der Hyperfeinstruktur des 3  2 P 3/2 -Zustands von Natrium mit der Level-crossing-Methode / Stark-Effect Investigation of the Hyperfine Structure of the 3  2 P 3/2 -State of Sodium by Level-Crossing-Method