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- W2913870511 abstract "We present new high-resolution data on the photoionization of the 2-butyn-1-yl radical (CH3C≡C–•CH2) formed by H atom abstraction from 2-butyne by F atoms. The spectra were recorded from 7.7 to 11 eV by using double-imaging, photoelectron–photoion coincidence spectroscopy, which allows the unambiguous correlation of photoelectron data and the mass of the species. The photoionization spectrum shows significant resonant autoionizing structure converging to excited states of the C4H5+ cation, similar to what is observed in the closely related propargyl radical (HC≡C–•CH2). The threshold photoelectron spectrum, obtained with a resolution of 17 meV, is also reported. This spectrum is consistent with previous measurements of the first photoionization band but has been extended to higher energy to allow the observation of bands corresponding to excited electronic states of the ion. A refined value of the adiabatic ionization energy is extracted: IE(C4H5) = 7.93 ± 0.01 eV. A determination of the absolute photoionization cross section of the 2-butyn-1-yl radical at 9.7 eV is also reported: σion(C4H5) = 6.1 ± 1.8 Mb." @default.
- W2913870511 created "2019-02-21" @default.
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- W2913870511 date "2019-01-29" @default.
- W2913870511 modified "2023-10-13" @default.
- W2913870511 title "Valence-Shell Photoionization of C<sub>4</sub>H<sub>5</sub>: The 2-Butyn-1-yl Radical" @default.
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- W2913870511 doi "https://doi.org/10.1021/acs.jpca.8b11809" @default.
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