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1993 (2)
1Author    M. A. Coplan, J. H. Moore, J. A. TossellRequires cookie*
 Title    (e, 2 e)-Spectroscopy and the Electronic Structure of Molecules. A Short Review with Selected Examples  
 Abstract    The simple plane wave target Hartree-Fock impulse approximation for the (e, 2e) reaction is developed. One result of the approximation is the separation of the expression for the (e, 2e) cross-section into a kinematic factor and a structure factor that contains all of the information about the target. When the target is a molecule, the structure factor can be further separated into atomic terms and a geometric term. This is illustrated for a simple one-electron homonuclear diatomic molecule. Three examples of the application of (e, 2e) spectroscopy to systems of chemical interest are given. They are borazine (inorganic benzene), the methyl siloxanes and the inorganic complex trimethylamine boron trifluoride. 
  Reference    Z. Naturforsch. 48a, 358—370 (1993); received January 30 1992 
  Published    1993 
  Keywords    (e, 2e)-Spectroscopy, Electron momentum spectroscopy, Electron momentum density, Electronic structure 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0358.pdf 
 Identifier    ZNA-1993-48a-0358 
 Volume    48 
2Author    Erich WeigoldRequires cookie*
 Title    Recent Advances in Electron Momentum Spectroscopy  
 Abstract    The flexibility of the (e, 2e) technique or "electron momentum spectroscopy" (EMS) in obtaining information on the electronic structure of atoms, molecules, and solids is demonstrated. High-resolution EMS measurements for argon, including the first measurements of momentum profiles belonging to the 2 P° and 2 D e -manifolds, are used to demonstrate the technique for atomic targets. The d-wave transitions in argon are entirely due to initial-state correlations. The first (e, 2e) measure-ments on an excited target, and also on an oriented target, are discussed. Sodium atoms are pumped to the m, = +1 state of the excited 3p-state by cr + -light from a laser. The (e, 2e) measurements on this excited state are in excellent agreement with the momentum density given by the 3p (m, — 1) Hartree-Fock wavefunction. The recent measurements of the valence-electron momentum distribu-tions for ethyne, as well as some earlier results for water, are used as an example of the application of EMS to the study of molecules. The application of the EMS technique to measure spectral momentum densities in condensed-matter targets is demonstrated by some recent results on amor-phous carbon. 
  Reference    Z. Naturforsch. 48a, 371—389 (1993); received March 28 1992 
  Published    1993 
  Keywords    Electron momentum densities, Electron momentum spectroscopy, Wavefunction map-ping, Binding energies 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0371.pdf 
 Identifier    ZNA-1993-48a-0371 
 Volume    48