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1993 (2)
1Author    J. R. Schmitz, H. Schulte-Schrepping, A. Berthold, S. Mourikis, W. SchülkeRequires cookie*
 Title    Performance of the Compton Spectrometer at HARWI/HASYLAB  
 Abstract    Performance, resolution and spectral throughput both of the sagittally focusing monochromator and of the alternately installed two analysing systems, a Cauchois-type cylindrically bent crystal analyser for Compton-profile measurements, and a spherically bent crystal analyser for S(q, (^-mea-surements, of the new Compton spectrometer at the HARWI (harter Röntgen Wiggler) of the DORIS storage ring are presented together with two typical applications. 
  Reference    Z. Naturforsch. 48a, 279—282 (1993); received December 24 1991 
  Published    1993 
  Keywords    X-ray spectrometer, Inelastic X-ray scattering, Focusing X-ray optics, Compton pro-file, Dynamic structure factor 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0279.pdf 
 Identifier    ZNA-1993-48a-0279 
 Volume    48 
2Author    A. Berthold, K.-J Gabriel, W. SchülkeRequires cookie*
 Title    The Dynamic Structure Factor of LiC 6 and KC 8 : Inelastic Synchrotron X-Ray Scattering Results  
 Abstract    The dynamic structure factor S(q, &>) of electrons in lithium-intercalated graphite (LiC 6) and potassium-intercalated graphite (KC 8) for momentum transfer q || c-axis has been measured by inelastic synchrotron X-ray scattering. The dielectric function s{q, a>) was deduced from the data and compared with e(q, co) of pristine graphite. The main feature in the different Im [e(q, tt>)]-spectra, a more or less intense peak around 14 eV, can be assigned to maxima of the symmetry-projected joint density of occupied and unoccupied electron states near the Fermi level. Knowing the position of the occupied bands by photoemission experi-ments, predictions about the unoccupied n and interlayer states can be made. In the case of LiC 6 , a shift and broadening of the first Im [e(q, a>)]-peak was found, which can be explained by a decrease of the energy of the interlayer-band because of the strong hybridization of this graphite-derived band with the Li metal 2s-band. In the case of KC 8 , a weakening of the first peak of Im [e(q, co)] was observed, which we attribute both to a decreasing overlap of the occupied 7t-derived state with the empty interlayer state and to a change of symmetry of the occupied er-derived states as well as of the empty rc-derived states. 
  Reference    Z. Naturforsch. 48a, 283—288 (1993); received December 30 1991 
  Published    1993 
  Keywords    Inelastic X-ray scattering, Dynamic structure factor, Graphite, Graphite intercalation compounds, Interlayer state 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0283.pdf 
 Identifier    ZNA-1993-48a-0283 
 Volume    48