Abstract
We measured the polarization of the first resonance lines of Li6, Li7 and Na23 excited by linearly polarized light in a modulated crossed-beam experiment. The results are as follows: Li6, degree of polarizationP=(37,5±1,7)%; Li7,P=(23,1± 1,3)%; Na23,P=(14,0±0,8)%. These values agree with those calculated by means ofBreit's theory for the polarization of resonance radiation and with the values ofHafner et al.3 for electron impact excitation at threshold. In accordance with the agreement the following relationship has been established: the mechanism for electron impact excitation of alkali resonance lines at threshold is determined by the same selection rule (Δm l ,=0) as in the case of linearly polarized optical excitation.
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The authors wish to thank Professor H.Krüger for his interest in this work.Hans Kleinpoppen is indebted to Professor M. J.Seaton for a very valuable discussion. The financial supports of the Deutsche Forschungsgemeinschaft and of the Bundesministerium für Wissenschaft und Forschung are gratefully acknowledged. The authors thank Dr. C.B.Lucas for his critical reading of the manuscript.
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Kleinpoppen, H., Neugart, R. Polarization of atomic line radiation. Z. Physik 198, 321–328 (1967). https://doi.org/10.1007/BF01326411
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DOI: https://doi.org/10.1007/BF01326411