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1993 (5)
1Author    F. Gasser, M. RoethRequires cookie*
 Title    Compton Profiles for Atoms and Molecules: Compton Defects  
 Abstract    A series expansion applied to the Born propagator present in the differential cross-section allows one to obtain successive corrections to the impulse approximation. The first and second corrections explain the essential features of the Compton defects. Results for the second corrective term are presented for 1 s, 2 s, 2 p x , and 2 p z hydrogenic states. The decrease or increase of the scattered intensity near the maximum of the Compton profile is shown to be strongly related to geometric properties of the concerned orbital 
  Reference    Z. Naturforsch. 48a, 257—260 (1993); received December 24 1991 
  Published    1993 
  Keywords    Electronic structure, Ionisation cross-section, Compton scattering 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0257.pdf 
 Identifier    ZNA-1993-48a-0257 
 Volume    48 
2Author    F. Bell, Th Tschentscher, J. R. Schneider, A. J. RollasonRequires cookie*
 Title    Electron Momentum Densities by (y, e y)-Spectroscopy  
 Abstract    We report coincidence measurements of inelastically scattered 148 keV photons and the recoil electrons generated within thin Al and Cu foils. We have analyzed both the Doppler broadening of the scattered photon intensity and the angular correlation of the recoil electron. This corresponds to different scans through the three-dimensional electron momentum density of the target. Estimates of the triple-differential cross-section for Compton scattering are given. The experiment was per-formed with synchrotron radiation from a bending magnet of the DORIS storage ring at DESY, Hamburg. 
  Reference    Z. Naturforsch. 48a, 273—278 (1993); received October 8 1991 
  Published    1993 
  Keywords    Electron momentum densities, Compton scattering, Synchrotron radiation 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0273.pdf 
 Identifier    ZNA-1993-48a-0273 
 Volume    48 
3Author    L. DobrzyńskiRequires cookie*
 Title    Recent Advances in Compton Scattering  
 Abstract    A review of achievements in the field of Compton spectrometry in the years that elapsed from the last Sagamore meeting (1988) is presented. Some physical problems that have either appeared as new or became clarified are described. Special emphasis is put to the results obtained by means of magnetic Compton scattering. 
  Reference    Z. Naturforsch. 48a, 266—272 (1993); received January 9 1992 
  Published    1993 
  Keywords    Compton scattering, Electron momentum distribution, Synchrotron radiation, Mag-netic materials 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0266.pdf 
 Identifier    ZNA-1993-48a-0266 
 Volume    48 
4Author    StephenW. LoveseyRequires cookie*
 Title    Theories of Compton Scattering by Magnetic Materials  
 Abstract    Theoretical work on the cross-section for Compton scattering by magnetic materials is surveyed. Exact results for scattering by a free polarized electron are contrasted with corresponding results obtained perturbatively for a model of bound electrons with a finite width to the momentum distribution. 
  Reference    Z. Naturforsch. 48a, 261—265 (1993); received December 14 1991 
  Published    1993 
  Keywords    Compton scattering, Scattering cross-section, Magnetic materials, Spin density in momentum space 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0261.pdf 
 Identifier    ZNA-1993-48a-0261 
 Volume    48 
5Author    A. BansilRequires cookie*
 Title    Modern Band Theory of Disordered Alloys: Basic Concepts Including a Discussion of Momentum Densities  
 Abstract    An overview of some of the basic concepts in the modern first-principles band theory of disordered alloys is given. The question of how the notion of Bloch energy bands and Fermi surfaces generalizes to the case of the disordered system, insofar as the average electronic spectrum is concerned, is stressed. The theory is illustrated with examples chosen from the work on binary alloys; a few examples of the very recent studies of disordered phases of the high-T c superconductors are also included. The application of the alloy theory to obtain electron and electron-positron momentum densities involved in the analysis of Compton scattering and positron annihilation (angular correla-tion) experiments in alloys is discussed, with a selection of relevant theoretical and experimental studies. 
  Reference    Z. Naturforsch. 48a, 165—179 (1993); received January 25 1992 
  Published    1993 
  Keywords    Disordered alloys, KKR-CPA, Momentum densities, Compton scattering, Positron annihilation (ACAR) 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0165.pdf 
 Identifier    ZNA-1993-48a-0165 
 Volume    48