| Issue |
EPL
Volume 92, Number 1, October 2010
|
|
|---|---|---|
| Article Number | 13001 | |
| Number of page(s) | 5 | |
| Section | Atomic, Molecular and Optical Physics | |
| DOI | https://doi.org/10.1209/0295-5075/92/13001 | |
| Published online | 13 October 2010 | |
Exact limiting relation between the structure factors in neutron and X-ray scattering
Joint Institute for High Temperatures, Russian Academy of Sciences - 13/19, Izhorskaia Str., Moscow 125412, Russia
Received:
31
August
2010
Accepted:
27
September
2010
The ratio of the static matter structure factor measured in experiments on coherent X-ray scattering to the static structure factor measured in experiments on neutron scattering is considered on the basis of the two-component electron-nuclear description of substances. It is shown that this ratio in the long-wavelength limit is equal to the nuclear charge at arbitrary thermodynamic parameters of a pure substance in a disordered state. This statement is the exact result of statistical mechanics in contrast to the similar approximate relation for the electron-ion plasmas, containing complex ions.
PACS: 31.10.+z – Theory of electronic structure, electronic transitions, and chemical binding / 05.30.-d – Quantum statistical mechanics / 52.27.Gr – Strongly-coupled plasmas
© EPLA, 2010
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