Influence Using impact excitation, the measurement of alignment relaxation rates of atomic states is influenced by cascading transitions. The two methods for measuring the collisional depolarization, the Hanle-effect and the direct measurement of the polarization of the emitted radiation, were investigated theoretically and compared. The results were checked by measuring the depolarization of helium states excited by electron impact.
The depolarization cross sections of the 3,4,5 3P-states were determined from Hanle-effect measurements as 1.8(4), 3.9(5), and 5.6(6) · 10-14 cm2 respectively.
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.