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• W1964082611 abstract "Negative ion photoelectron (NIPE) spectra of the radical anion of cyclopropane-1,2,3-trione, (CO)3•–, have been obtained at 20 K, using both 355 and 266 nm lasers for electron photodetachment. The spectra show broadened bands, due to the short lifetimes of both the singlet and triplet states of neutral (CO)3 and, to a lesser extent, to the vibrational progressions that accompany the photodetachment process. The smaller intensity of the band with the lower electron binding energy suggests that the singlet is the ground state of (CO)3. From the NIPE spectra, the electron affinity (EA) and the singlet–triplet energy gap of (CO)3 are estimated to be, respectively, EA = 3.1 ± 0.1 eV and ΔEST = −14 ± 3 kcal/mol. High-level, (U)CCSD(T)/aug-cc-pVQZ//(U)CCSD(T)/aug-cc-pVTZ, calculations give EA = 3.04 eV for the 1A1′ ground state of (CO)3 and ΔEST = −13.8 kcal/mol for the energy gap between the 1A1′ and 3A2 states, in excellent agreement with values from the NIPE spectra. In addition, simulations of the vibrational structures for formation of these states of (CO)3 from the 2A2″ state of (CO)3•– provide a good fit to the shapes of broad bands in the 266 nm NIPE spectrum. The NIPE spectrum of (CO)3•– and the analysis of the spectrum by high-quality electronic structure calculations demonstrate that NIPES can not only access and provide information about transition structures but NIPES can also access and provide information about hilltops on potential energy surfaces." @default.
• W1964082611 created "2016-06-24" @default.
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• W1964082611 date "2014-08-22" @default.
• W1964082611 modified "2023-10-16" @default.
• W1964082611 title "The Negative Ion Photoelectron Spectrum of Cyclopropane-1,2,3-Trione Radical Anion, (CO)₃^•– — A Joint Experimental and Computational Study" @default.
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• W1964082611 doi "https://doi.org/10.1021/ja505582k" @default.
• W1964082611 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25148567" @default.
• W1964082611 hasPublicationYear "2014" @default.
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