000441818 001__ 441818 000441818 005__ 20250716152013.0 000441818 0247_ $$2doi$$a10.1103/PhysRevLett.124.225002 000441818 0247_ $$2ISSN$$a0031-9007 000441818 0247_ $$2ISSN$$a1079-7114 000441818 0247_ $$2ISSN$$a1092-0145 000441818 0247_ $$2datacite_doi$$a10.3204/PUBDB-2020-02737 000441818 0247_ $$2altmetric$$aaltmetric:83432040 000441818 0247_ $$2pmid$$apmid:32567902 000441818 0247_ $$2WOS$$aWOS:000537620500007 000441818 0247_ $$2openalex$$aopenalex:W3033743866 000441818 037__ $$aPUBDB-2020-02737 000441818 041__ $$aEnglish 000441818 082__ $$a530 000441818 1001_ $$0P:(DE-H253)PIP1007842$$aVinko, Sam$$b0$$eCorresponding author 000441818 245__ $$aTime-Resolved XUV Opacity Measurements of Warm Dense Aluminum 000441818 260__ $$aCollege Park, Md.$$bAPS$$c2020 000441818 3367_ $$2DRIVER$$aarticle 000441818 3367_ $$2DataCite$$aOutput Types/Journal article 000441818 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1594886778_5400 000441818 3367_ $$2BibTeX$$aARTICLE 000441818 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000441818 3367_ $$00$$2EndNote$$aJournal Article 000441818 520__ $$aThe free-free opacity in plasmas is fundamental to our understanding of energy transport in stellar interiors and for inertial confinement fusion research. However, theoretical predictions in the challenging dense plasma regime are conflicting and there is a dearth of accurate experimental data to allow for direct model validation. Here we present time-resolved transmission measurements in solid-density Al heated by an XUV free-electron laser. We use a novel functional optimization approach to extract the temperature-dependent absorption coefficient directly from an oversampled pool of single-shot measurements, and find a pronounced enhancement of the opacity as the plasma is heated to temperatures of order of the Fermi energy. Plasma heating and opacity enhancement are observed on ultrafast timescales, within the duration of the femtosecond XUV pulse. We attribute further rises in the opacity on ps timescales to melt and the formation of warm dense matter. 000441818 536__ $$0G:(DE-HGF)POF3-6211$$a6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621)$$cPOF3-621$$fPOF III$$x0 000441818 536__ $$0G:(DE-HGF)POF3-6G2$$a6G2 - FLASH (POF3-622)$$cPOF3-622$$fPOF III$$x1 000441818 536__ $$0G:(DE-82)ZUK2-SU-StUpPD_149_14$$aStUpPD_149_14 - Selective C-C bond cleavage in alkoxides, applicable in lignin valorization (ZUK2-SU-StUpPD_149_14)$$cZUK2-SU-StUpPD_149_14$$x2 000441818 536__ $$0G:(EU-Grant)312284$$aCALIPSO - Coordinated Access to Lightsources to Promote Standards and Optimization (312284)$$c312284$$fFP7-INFRASTRUCTURES-2012-1-RTD$$x3 000441818 588__ $$aDataset connected to CrossRef 000441818 693__ $$0EXP:(DE-H253)F-BL2-20150101$$1EXP:(DE-H253)FLASH-20150101$$6EXP:(DE-H253)F-BL2-20150101$$aFLASH$$fFLASH Beamline BL2$$x0 000441818 7001_ $$0P:(DE-H253)PIP1023325$$aVozda, Vojtech$$b1 000441818 7001_ $$0P:(DE-H253)PIP1007802$$aAndreasson, Jakob$$b2 000441818 7001_ $$0P:(DE-H253)PIP1006443$$aBajt, S.$$b3 000441818 7001_ $$0P:(DE-H253)PIP1020945$$aBielecki, Johan$$b4 000441818 7001_ $$0P:(DE-H253)PIP1007807$$aBurian, Tomas$$b5 000441818 7001_ $$0P:(DE-H253)PIP1006744$$aChalupsky, Jaromir$$b6 000441818 7001_ $$0P:(DE-H253)PIP1013810$$aCiricosta, Orlando$$b7 000441818 7001_ $$0P:(DE-HGF)0$$aDesjarlais, M. 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