| Title: |
Experimental Evidence for the Breakdown of Uniform-Electron-Gas Models in Warm Dense Aluminium |
| Authors: |
Bespalov, Dmitrii S.; Zastrau, Ulf; Moldabekov, Zhandos A.; Gawne, Thomas; Dornheim, Tobias; Meshhal, Moyassar; Amouretti, Alexis; Andrzejewski, Michal; Appel, Karen; Baehtz, Carsten; Brambrink, Erik; Buakor, Khachiwan; Camarda, Carolina; Chin, David; Collins, Gilbert; Crépeisson, Céline; Descamps, Adrien; Eggert, Jon; Fletcher, Luke; Forte, Alessandro; Gregori, Gianluca; Harmand, Marion; Humphries, Oliver S.; Höppner, Hauke; Kuhlke, Jonas; Lynn, William; Lütgert, Julian; Masruri, Masruri; McBride, Emma M.; McWilliams, Ryan Stewart; Mora, Alan Augusto Sanjuan; Naedler, Jean-Paul; Neumayer, Paul; Palmer, Charlotte; Pelka, Alexander; Pennacchioni, Lea; Prestwood, Calum; Pukhareva, Natalia A.; Qu, Chongbing; Ranjan, Divyanshu; Redmer, Ronald; Roper, Michael; Sahle, Christoph; Schumacher, Samuel; Schwinkendorf, Jan-Patrick; Sieber, Melanie J.; Singleton, Madison; Smith, Ethan; Sternemann, Christian; Stevens, Thomas; Stevenson, Michael; Strohm, Cornelius; Tang, Minxue; Toncian, Monika; Toncian, Toma; Tschentscher, Thomas; Vinko, Sam M.; Wark, Justin S.; Wilke, Max; Kraus, Dominik; Preston, Thomas R. |
| Publication Year: |
2025 |
| Collection: |
ArXiv.org (Cornell University Library) |
| Subject Terms: |
Plasma Physics; Strongly Correlated Electrons |
| Description: |
The robust diagnosis of thermodynamic conditions in warm dense matter experiments remains a central challenge. We report angle-resolved femtosecond x-ray Thomson scattering measurements of shock-compressed aluminum at approximately 50 GPa over a wide range of scattering wavevectors at the European XFEL. The measured plasmon dispersion and line shape demonstrate that the standard analysis of x-ray Thomson scattering spectra based on uniform electron gas models systematically overestimates the plasmon resonance energy by up to 8 eV. In contrast, an analysis based on ab initio calculations reproduces both the dispersion and spectral shape within experimental uncertainty. Our results show that shock-induced disorder plays a critical role in the interpretation of x-ray Thomson scattering from compressed solids and provide direct evidence that ab initio approaches are required for reliable inference of thermodynamic conditions in warm dense aluminum. ; 14 pages, 11 figures |
| Document Type: |
text |
| Language: |
unknown |
| Relation: |
http://arxiv.org/abs/2509.10107 |
| Availability: |
http://arxiv.org/abs/2509.10107 |
| Accession Number: |
edsbas.AA8DDB42 |
| Database: |
BASE |