{"paper":{"title":"Unraveling the relaxation dynamics of Uracil: insights from time-resolved X-ray photoelectron spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Alberto De Fanis, Bj\\\"orn Senfftleben, Bruno Nunes Cabral Tenorio, Carlo Callegari, Caterina Vozzi, Daniel E. Rivas, Davide Faccial\\`a, Fabiano Lever, Kevin C. Prince, Lorenzo Avaldi, Marcello Coreno, Maria Novella Piancastelli, Marin Sapunar, Markus G\\\"uhr, Matteo Bonanomi, Michael Meyer, Michele Devetta, Michele Di Fraia, Na{\\dj}a Do\\v{s}li\\'c, Nitish Pal, Oksana Plekan, Paola Bolognesi, Piero Decleva, Robert Richter, Sergey Usenko, Sonia Coriani, Terry Mullins, Tommaso Mazza, Yevheniy Ovcharenko","submitted_at":"2025-03-24T14:33:04Z","abstract_excerpt":"We report a study of the electronic and nuclear relaxation dynamics of the photoexcited RNA base uracil in the gas phase, using time-resolved core level photoelectron spectroscopy together with high level calculations. The dynamics was investigated by trajectory surface-hopping calculations, and the core ionization energies were calculated for geometries sampled from these. The molecule was excited by a UV laser and dynamics was probed on the oxygen, nitrogen and carbon site by core electron spectroscopy. Assuming a particular model, we find that the initially excited $S_2(\\pi\\pi^*)$ state of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.18723","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2503.18723/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}