The dielectric function ε(q,ω) of Li-intercalated graphite (LiC₆) with q∥c axis was deduced from inelastic x-ray scattering data and compared with ε(q,ω) of pristine graphite. A displacement and broadening of the first peak of Imε(q,ω) upon intercalation was found, which we attribute to a 2-eV shift of the "metal" σ state of LiC₆ to lower energies relative to the σ-type interlayer state of graphite.
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Schülke et al. (1988) studied this question.
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