Abstract The level-crossing-method has been used for an investigation of the hyperfine structure of the first excited 3 2P3/2-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 2P3/2-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 2P3/2-state and S-states in the sodium spectrum.
An experimental investigation of the Cs 6s 2S1/2→6p 2P3/2→10s 2S1/2 double-resonance two-photon polar-ization spectrum has been made. In the investigation, a linear polarization degree was measured to extract the alignment depolarization cross section in the cesium 6p 2P3/2 level due to collisions between ground-level argon and excited 6p 2P3/2 cesium atoms over the Zeeman coherences. The spectra show strong depolarization of the Cs 6p 2P3/2 level. The measured alignment depolarization cross section value of 186 58 Å2 is in good agreement with the experiment and theoretical predictions. DOI: 10.1103/PhysRevA.73.042713 PACS numbers: 32.80.t, 32.70.n I.