Dissociative excitation of the fluoromethanes by electron impact |
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Authors: | O Keller C Mang M Nikola G Schulz |
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Institution: | Fachbereich Experimentalphysik, Universit?t des Saarlandes, 66041 Saarbrücken, Germany, DE
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Abstract: | Emission spectra following electron impact on molecules of the homologous series of fluoromethanes CHxF4-x with x=0-4 have been investigated from the near infrared at 700 nm to the ultraviolet VUV-spectral region at 100 nm. Earlier experimental
data for the visible and ultraviolet spectral region were revised and evaluated again on the basis of reliable new data for
the dynamic viscosity of the molecules. The measurement of absolute and relative cross-sections were systematically extended
into the VUV region from 100 nm to 200 nm. The examination of atomic lines as well as molecular band systems in the VUV gives
further insight into the dissociation mechanism and shows that many excited levels even of atomic and molecular species cannot
be populated directly, but only by transitions from higher-lying energy levels. Simple steric effects can be distinguished
from more complex transition phenomena.
Received: 25 February 1998 / Revised: 29 May 1998 and 18 June 1998 / Accepted: 23
June 1998 |
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Keywords: | PACS 34 80 Gs Molecular excitation and ionization by electron impact - 52 20 Fs Electron collisions |
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