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- W2092131012 abstract "The photoion-photoelectron coincidence (PIPECO) spectra for ArCO+ in the wavelength region of 620–940 Å have been measured at different nozzle expansion conditions. The ionization energy (IE) for CO+(≈X)·Ar is determined to be 13.33±0.06 eV (930±4 Å). Using this value, the IE for CO+(≈X), and the estimated binding energy for Ar·CO, we calculate a value of 0.70 ± 0.06 eV for the dissociation energy of CO+(X)·Ar. The excited Ar+(2PJ)·CO and CO+ (≈A or ≈B)·Ar dimer ions formed by the photoionization of ArCO are found to be dissociative. The dissociation of Ar+(2PJ)·CO is rationalized by a stepwise mechanism involving the formation of a vibrationally excited CO+(≈X,ν′)·Ar complex by near-resonance intramolecular charge transfer and the subsequent dissociation of the complex by vibrational predissociation. Assuming that the radiative lifetimes of CO+(≈A,≈B) and CO+(≈A,≈B)·Ar are identical, we estimate that the dissociation lifetimes of·ar CO+(≈A)·Ar and CO+ (≈B)·Ar are shorter than the radiative lifetimes of CO+(≈A) (≈4 μs) and CO+(≈B) (≈50 ns), respectively. The formation of ArCO+ and (CO)2+ from the fragmentation of excited Ar+(2PJ)·(CO)2 and Ar+(2PJ)·(ArCO) trimer ions is efficient. The good agreement found in the comparison of the measured vibrational distribution of CO+(≈X,ν′) produced in the Ar+(2P32)+CO charge transfer reaction and the profile for the ArCO+ and (CO)2+ coincidence electronic bands arisen from the dissociation of Ar+(2P32)·(CO)2 and/ or Ar+(2P32)·(ArCO) implies the involvement of near-resonance intramolecular charge transfer between Ar+(2P32) and a CO molecule in the trimer ions prior to their decomposition. Evidence supporting a binding energy for Ar+(2P32)·CO to lie in the range of 0.66–0.97 eV is found." @default.
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- W2092131012 date "1989-01-01" @default.
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- W2092131012 title "A Study of intramolecular charge transfer in mixed Ar/CO dimer and trimer ions using the photoion-photoelectron coincidence method" @default.
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- W2092131012 doi "https://doi.org/10.1016/0301-0104(89)80023-0" @default.
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