Abstract
Polarization of the radiation from Zn and Cd atoms (n = 4 for Zn and 5 for Cd, respectively) was observed after electron impact with energy slightly above the threshold excitation energy. The observing direction was perpendicular to both the incident electron beam and the atomic beam. All of the triplet radiation (J = 0, 1 and 2) was slightly polarized. The observed fractional polarization degrees were and corresponding to J = 0, 1 and 2 spectra in the final states of the Zn atom and , 4.3 and for the Cd atom. These values could be explained by assuming populations in the sublevels and of the states deviating from an equal mean value of for each sublevel. It is interesting and reasonable that the deviations determined independently for different states coincided with each other quite well. The deviated values of fractional population for the sublevel were 0.36 for Zn and 0.37 for Cd, respectively.
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