The dynamic structure factor S(q,{ω}) of conduction electrons in single-crystal Al has been measured using 5.66-keV synchrotron x radiation with 1.5-eV energy resolution. These measurements confirm the existence of strong non-random-phase-approximation-like correlations in an electron liquid where band-structure effects are unimportant.
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Platzman et al. (1992) studied this question.
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