ELECTRON IMPACT EXCITATION OF IR ACTIVE VIBRATION OF MOLECULES
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Date
1972
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Ohio State University
Abstract
Cross sections for the excitation of infrared active vibrational modes by electron collisions have been investigated both in the Born approximation and in the close-coupling method. The result shows that the Born approximation is quite good for small-angle scattering, even for slow collisions. The reason is the dominance of the long-range dipole interaction in the forward scattering. In the Born theory, the vibrational excitation cross section is directly related to the infrared absorption intensity. Hence, when the infrared intensity is known, the cross section can be obtained easily, or vice versa. This fact suggests a normalization method of an electron-loss spectrum of a molecule; the intensity scale of the spectrum can be normalized at a vibrational-loss peak for which the infrared intensity is available. This normalization method has been applied to the energy-loss spectrum of acetone and compared with some other methods. This work was performed under the auspices of the U.S. Atomic Energy Commission.
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Author Institution: Argonne National Laboratory