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II) Electron-Impact Excitation out of the ground state of AtomsC. Excitation of Neon, ArgonNeon 2p^{5}3p levelsSo far, we have only considered the shape of the excitation functions. Let us now examine the magnitudes of the cross sections. The following table lists the cross section at 100 eV for the ten 2p (Pachen notation) of neon in units of 10^{-20} cm^{2}.
This is the same as a one electron excitation 2p (l=1)-->3p (l'=1). From the mulipole field analysis (k=0,1,2,3,...) we find that for l=1-->l'=1, only terms with k=0 and k=2 are compatible. Thus,
Thus, our standard multipole expansion arguement agrees with the experimental data: references: Experimental and Theoretical Studies of Electron-Impact Excitation of Neon Francis A. Sharpton, Robert M St. John, Chun C. Lin, and Fredric E. Fajen, Physical Review A 2 (1970) 1305-1322. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
last updated: May-15-1997 |