ISSN:
1434-6036
Keywords:
PACS. 71.45.Gm Exchange, correlation, dielectric and magnetic functions, plasmons - 78.70.Ck X-ray scattering - 71.20.Dg Alkali and alkaline earth metals
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: The dynamic structure factor of Li with [110] and 0.88 a.u. 〈q〈 1.03 a.u., as measured with 1 eV resolution by means of synchrotron radiation based inelastic X-ray scattering spectroscopy (IXSS), exhibits, in the energy loss range between 3 and 12 eV, a fine structure, which appears as a resonance around 4 eV and an antiresonance around 8 eV, when the difference between the experimental -spectra with [110] and [111] is considered. In order to find out the origin of this fine structure we have interpreted recent TLDA (time dependent local density approximation) calculations of the Li- [#!ref12!#], which were based on the inversion of the full dielectric matrix, by utilizing a simple two-plasmon-band model. In this way the fine structure can be traced back to a Fano-like coupling of the discrete collective excitations (both the regular plasmon and the so-called zone-boundary collective states (ZBCS's)) and the particle-hole excitation continuum, mediated by the off-diagonal elements of the dielectric matrix, , where (1,1,0).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050418
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