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A. A. Ivanov

Indicator of efficiency of experiment in the gas electron diffraction (GED)

Abstract

The ineffectiveness of the traditional probe electron diffraction experiment on free molecules (atoms) has been shown, which prevents the development of the diffraction structural method in gas phase electron diffraction. Molecular beam application allowed to determine the quantitative performance indicator of the scattering process on the given experimental equipment. The quantitative value of effective cross-section on residual gas molecules σext(SmaxÅ–1) has been suggested as a technical characteristic for the electron diffraction equipment complex. A nomographic chart for determining the number of molecules of any substance has been drawn up, in order to obtain a given density of scattered charge on the detector within the maximum sector radius. The author refers to the GED-community of the need to agree on a single estimate of the efficiency of electron scattering experiment at the free molecules.
Key words: gas phase electron diffraction, efficiency of process, molecular beam, scattering cross-section.
Moscow University Chemistry Bulletin.
2013, Vol. 54, No. 2, P. 81
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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