000826054 001__ 826054 000826054 005__ 20210129225518.0 000826054 0247_ $$2doi$$a10.1021/acs.jpclett.6b02517 000826054 0247_ $$2Handle$$a2128/13423 000826054 0247_ $$2WOS$$aWOS:000391653200032 000826054 0247_ $$2altmetric$$aaltmetric:14863966 000826054 0247_ $$2pmid$$apmid:27935313 000826054 037__ $$aFZJ-2017-00323 000826054 041__ $$aEnglish 000826054 082__ $$a530 000826054 1001_ $$0P:(DE-HGF)0$$aPuschnig, P.$$b0$$eCorresponding author 000826054 245__ $$aEnergy Ordering of Molecular Orbitals 000826054 260__ $$aWashington, DC$$bACS$$c2016 000826054 3367_ $$2DRIVER$$aarticle 000826054 3367_ $$2DataCite$$aOutput Types/Journal article 000826054 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1484205024_29822 000826054 3367_ $$2BibTeX$$aARTICLE 000826054 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000826054 3367_ $$00$$2EndNote$$aJournal Article 000826054 520__ $$aOrbitals are invaluable in providing a model of bonding in molecules or between molecules and surfaces. Most present-day methods in computational chemistry begin by calculating the molecular orbitals of the system. To what extent have these mathematical objects analogues in the real world? To shed light on this intriguing question, we employ a photoemission tomography study on monolayers of 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA) grown on three Ag surfaces. The characteristic photoelectron angular distribution enables us to assign individual molecular orbitals to the emission features. When comparing the resulting energy positions to density functional calculations, we observe deviations in the energy ordering. By performing complete active space calculations (CASSCF), we can explain the experimentally observed orbital ordering, suggesting the importance of static electron correlation beyond a (semi)local approximation. On the other hand, our results also show reality and robustness of the orbital concept, thereby making molecular orbitals accessible to experimental observations. 000826054 536__ $$0G:(DE-HGF)POF3-142$$a142 - Controlling Spin-Based Phenomena (POF3-142)$$cPOF3-142$$fPOF III$$x0 000826054 588__ $$aDataset connected to CrossRef 000826054 7001_ $$0P:(DE-HGF)0$$aBoese, A. D.$$b1 000826054 7001_ $$0P:(DE-Juel1)142384$$aWillenbockel, M.$$b2 000826054 7001_ $$0P:(DE-HGF)0$$aMeyer, M.$$b3 000826054 7001_ $$0P:(DE-HGF)0$$aLüftner, D.$$b4 000826054 7001_ $$0P:(DE-HGF)0$$aReinisch, E. M.$$b5 000826054 7001_ $$0P:(DE-HGF)0$$aUles, T.$$b6 000826054 7001_ $$0P:(DE-HGF)0$$aKoller, G.$$b7 000826054 7001_ $$0P:(DE-HGF)0$$aSoubatch, S.$$b8 000826054 7001_ $$0P:(DE-HGF)0$$aRamsey, M. G.$$b9 000826054 7001_ $$0P:(DE-Juel1)128791$$aTautz, F. 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