The effect of single particle damping on S ( q , ω) for the homogeneous electron liquid is examined and clarified. A dip in S ( q , ω) is found to be caused by a rapid increase in the damping when the electron involved is able to emit a plasmon. This explains quite well experimental results from inelastic X-ray scattering.
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Niklasson et al. (1983) studied this question.
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