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1994 (1)
1993 (1)
1Author    Alejandro Saenz, Wolf WeyrichRequires cookie*
 Title    The Generalised Oscillator-Strength Density of the Helium Atom, Calculated by a New Implementation of the Complex-Coordinate Method  
 Abstract    We report a calculation of the generalised oscillator-strength density (GOSD) of the helium atom for low momentum transfer. The calculation was performed by extraction of the searched entity from the resolvent of the complex-rotated Hamiltonian. That Hamiltonian was found using a standard ab-initio program without any change in the program code. The shape of the Bethe surface is reproduced (including resonances and the absorption edge). However, with increasing momentum transfer the magnitude of the calculated values for the Bethe ridge becomes too small. This is clearly demonstrated by an evaluation of the Bethe sum as a function of the momentum transfer. A comparison with recent additional theoretical data shows that the deviations are due to the em-ployed basis set. 
  Reference    Z. Naturforsch. 48a, 243—250 (1993); received April 25 1992 
  Published    1993 
  Keywords    Generalised oscillator-strength density, Complex scaling, Bethe surface, Ab-initio cal-culation, Inelastic scattering 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0243.pdf 
 Identifier    ZNA-1993-48a-0243 
 Volume    48 
2Author    A. G. Oldbach1, F. H. Ensel1, K. R. Ad, Em An NRequires cookie*
 Title    Size-dependent Trends in the Scattering of Small Potassium Clusters by Water Molecules  
 Abstract    Scattering o f small potassium clusters by water molecules has been studied in a molecular beam experiment for the first time. In the size range up to eight atom s, trends for cross sections have been obtained by investigating low energy collisions. Significant differences in relative cross sections can be assigned to inelastic collisions. As in case o f scattering o f sodium clusters by argon (Goerke, A. et al., J. Chem. Phys. 98, 9653 (1993)), rotational excitation o f the clusters seems to be the dominating interaction. 
  Reference    Z. Naturforsch. 49a, 1067—1073 (1994); received September 28 1994 
  Published    1994 
  Keywords    Potassium clusters, Inelastic scattering, M olecular beam, Mass spectrometry, P hoto­ ionization 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1067.pdf 
 Identifier    ZNA-1994-49a-1067 
 Volume    49