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- W4366996778 abstract "The decarboxylation dynamics of the doubly deprotonated fluorescein dianion, Fl2−, are investigated by recording fragment action spectra for the anion, Fl−, and its decarboxylated analog, Fl–CO2−, using a new reflectron secondary mass spectrometer. The formation of the anion, Fl−, is directly investigated by photoelectron imaging. The Fl− and Fl–CO2− action spectra indicate that, for λ < 400 nm, one-photon dissociative photodetachment, i.e., simultaneous decarboxylation and electron loss, competes with photodetachment, whereas for λ > 400 nm, decarboxylation only proceeds following electron loss via a sequential two-photon process. The primary decarboxylation pathway is the ready loss of CO2 from the relatively short-lived intermediate excited state, Fl−[D1], which is formed by electron loss from the dianion via resonant tunneling through the repulsive Coloumb barrier associated with a high-lying excited dianion state, Fl2−[S2]." @default.
- W4366996778 created "2023-04-27" @default.
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- W4366996778 date "2023-04-21" @default.
- W4366996778 modified "2023-10-14" @default.
- W4366996778 title "Unraveling the decarboxylation dynamics of the fluorescein dianion with fragment action spectroscopy" @default.
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- W4366996778 doi "https://doi.org/10.1063/5.0144851" @default.
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