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Published June 1963 | Published
Journal Article Open

Differences between Low-Energy Electron Impact Spectra at 0º and at Large Scattering Angle

Abstract

The preceding Comment reports some low-energy electron-impact spectra of helium and ethylene, obtained by a very elegant technique, which are markedly different from the ones we obtained 1 under other experimental conditions. It is quite important to try to understand the reasons for the differences observed. These differences are essentially the following: (a) In our impact spectra of helium obtained with 50-eV electrons we observe pronounced peaks corresponding to the 2 ^3S state and to ionization whereas Simpson and Mielczarek do not. (b) In our spectra of ethylene at this same incident electron energy we observe two pronounced optically forbidden transitions and

Additional Information

© 1963 American Institute of Physics. Received 3 June 1963. Online Publication Date: 29 June 2004. This work was supported in part by the U. S. Atomic Energy Commission.

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