II) Electron-Impact Excitation out of the ground state of Atoms
D. Pressure Effects
Collision Transfer Mechanism for He 33D
Due to collisional transfer, the value of the apparent cross section increases with pressure, and the shape of the excitation function changes from a sharp peak to a broad maxima.
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references:
Theory of Collision Transfer of Excitation in Helium Chun C. Lin, and Richard G. Fowler, Annal of Physics 15 (1961) 461-469.
Collisional Excitation Transfer to the 41D State in Helium by Multiple State Mechanism Chun C. Lin, and Robert M. St. John, Physical Review 128 (1962) 1749-1753.
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