| | 1 | Author
| A. Berthold, K.-J Gabriel, W. Schülke | Requires 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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| default:Reihe_A/48/ZNA-1993-48a-0283.pdf | | | | Identifier
| ZNA-1993-48a-0283 | | | | Volume
| 48 | |
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