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- W2038244562 abstract "The H2CCC− ion is studied by autodetachment spectroscopy in a coaxial laser-ion beam spectrometer. Sharp resonances at photon energies near the photodetachment threshold energy are ascribed to a 2A1←2B1 transition followed by autodetachment of the dipole-bound state (DBS). Some 2500 rotational transitions are assigned and the band origin is determined to be 14 284.420(5) cm−1. The observation of individual rotational lines allowed determination of the rotational spectroscopic constants as A=9.651 53(4) cm−1 and (B+C)/2=0.346 461(3) cm−1 for the DBS as well as the spin-rotation coupling constant εaa=2.17(6)×10−3 cm−1. Based on an electron affinity of 14 469±64 cm−1, the binding energy of the electron in the DBS is 170±50 cm−1. Anomalous rotational line positions are found in the vicinity of Ka=7–10 in the DBS and have been attributed to the centrifugal distortion couplings caused by mixing with the CCC out-of-plane bending mode (ν6) and the CCC in-plane bending mode (ν9). The linewidths provide information about autodetachment rates that make it possible to obtain electron detachment dynamics for individual rotational states." @default.
- W2038244562 created "2016-06-24" @default.
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- W2038244562 date "1996-12-22" @default.
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- W2038244562 title "Autodetachment spectroscopy and dynamics of dipole bound states of negative ions: <sup>2</sup><i>A</i><sub>1</sub>–<sup>2</sup><i>B</i><sub>1</sub> transitions of H<sub>2</sub>CCC<sup>−</sup>" @default.
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- W2038244562 doi "https://doi.org/10.1063/1.472878" @default.
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