Theory of collision transfer of excitation in helium

A theory is presented to explain the multiple state mechanism for the transfer of excitation from singlet to triplet states in helium atoms proposed by St. John and Fowler. The spin-orbit interactions produce substantial singlettriplet mixing in the F states which is responsible for the transfer. It...

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Bibliographic Details
Published in:Annals of physics 1961-09, Vol.15 (3), p.461-469
Main Authors: Lin, Chun C, Fowler, Richard G
Format: Article
Language:English
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Summary:A theory is presented to explain the multiple state mechanism for the transfer of excitation from singlet to triplet states in helium atoms proposed by St. John and Fowler. The spin-orbit interactions produce substantial singlettriplet mixing in the F states which is responsible for the transfer. It is shown that a helium atom in an n 1 P state, after colliding with a normal atom, transfers primarily into the “mixed” nF states which in turn cascade to 3 3 D. The population of the 3 3 D state is calculated as 4.0 × 10 5 atoms/cm 3 as compared to 1.28 × 10 5 atoms/cm 3 from experiment.
ISSN:0003-4916
1096-035X
DOI:10.1016/0003-4916(61)90194-4