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- W1985087755 abstract "The nearly-free-electron (NFE) pseudopotential theory is used to calculate the wave-vector-dependent plasmon linewidth due to interband transitions in lithium, sodium, and potassium. It is shown that interband excitations constitute the dominant decay mechanism which for all alkali metals results in a decreasing linewidth for small $stackrel{ensuremath{rightarrow}}{mathrm{k}}$, contrary to a recent model calculation by Gibbons. Together with estimates of contributions from two particlehole pair excitations and from phonon- and impurity-assisted intraband and interband transitions, the resulting linewidth is compared with experiment. In Li, the total linewidth decreases for $kensuremath{lesssim}0.5{k}_{F}$, as borne out by experiment, whereas for Na and K the contribution from pair-pair excitations leads finally to an increasing linewidth, in qualitative agreement with experiment. Remaining quantitative discrepancies suggest that interband transitions to empty $d$ bands beyond the NFE model contribute to the plasmon linewidth in K and possibly also in Na." @default.
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- W1985087755 date "1981-09-15" @default.
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- W1985087755 title "Wave-vector-dependent plasmon linewidth in the alkali metals" @default.
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- W1985087755 doi "https://doi.org/10.1103/physrevb.24.3054" @default.
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