Electronic Collision Cross Sections and Ionization Phenomena in Atmospheric Gases.
Final rept. 1972-74,
CARNEGIE-MELLON UNIV PITTSBURGH PA MELLON INST OF SCIENCE
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The report gives brief descriptions of generalized oscillator strength determinations on He, Ha, and H2O. The results are also given for theoretical studies on a newly defined transition potential, whose Fourier transform is proportional to the collision amplitude. Theoretical explanations are given for the exceptional strength of excitation of both singlet-singlet and singlet-triplet transitions, by electron impact, in forward scattering when the orbital term symbols are the same in ground and excited states. The first applications of a newly developed electron spectrometer are briefly described. The instrument has been used in both conventional collision cross section studies on the 1 singlet S to 2 singlet S and to 2 singlet P transitions in helium and also, using fast coincidence techniques, in the study of the autoionized transition in helium at about 60 eV.
- Atomic and Molecular Physics and Spectroscopy