Heavy particle dynamics in liquid Se: Inelastic X-ray scattering
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JPSJ_76-5_053601.pdf 362 KB
Baron, Alfred Q. R.
inelastic X-ray scattering
de Gennes narrowing
The dynamic structure factor of liquid Se was measured at 523 K using high-resolution inelastic X-ray scattering. Anomalous narrowing of the spectrum was observed at 15 nm-1, where the static structure factor S(Q) exhibits a weak shoulder, but the elastic part of the dynamic structure factor S(Q,E = 0) exhibited a strong maximum. The second frequency moment, which is estimated from only the quasi-elastic peak, is consistent with the motion of rigid six-atom clusters, while a formal agreement with the first-moment sum rule is preserved by the appearance of a weak intramolecular mode at 30 meV.
Journal of the Physical Society of Japan
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