{"doi":"10.1021/acs.jpca.4c02509","title":"The Ring-Closing Reaction of Cyclopentadiene Probed with Ultrafast X-ray Scattering","abstract":"High Resolution Image Download MS PowerPoint Slide The dynamics of cyclopentadiene (CP) following optical excitation at 243 nm was investigated by time-resolved pump–probe X-ray scattering using 16.2 keV X-rays at the Linac Coherent Light Source (LCLS). We present the first ultrafast structural evidence that the reaction leads directly to the formation of bicyclo[2.1.0]pentene (BP), a strained molecule with three- and four-membered rings. The bicyclic compound decays via a thermal backreaction to the vibrationally hot CP with a time constant of 21 ± 3 ps. A minor channel leads to ring-opened structures on a subpicosecond time scale.","journal":"The Journal of Physical Chemistry A","year":2024,"id":455790,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":6,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9461,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2024-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1280280,"name":"Lauren Bertram","orcid":null,"position":1,"is_corresponding":false},{"id":1279875,"name":"Lingyu Ma","orcid":"0000-0002-2300-1132","position":2,"is_corresponding":false},{"id":930994,"name":"Nathan Goff","orcid":"0009-0008-3007-0639","position":3,"is_corresponding":false},{"id":1279876,"name":"Stuart W. 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