Abstract
Kinetic studies of the reactions of neutral lead clusters with NO2, NO and O2 were performed at 300 K. Reaction with NO2 is rapid, with the observed second-order rate constants for most clusters being between 0.2 and 5 × 10−11 cm3/s. There is a general trend of increasing rate with cluster size, although a few clusters display unusually high or low rates compared to ones of neighboring size. The reactions with NO are considerably slower by factors ranging from about 5 to 10. Reaction products are observed by laser ionization at 193 and 222 nm in conjunction with time-of-flight mass spectrometry. At lower fluence, the association products Pb x (NO2)+ and Pb x (NO2) +2 are observed in the case of reactions with NO2. At higher laser fluence, Pb + x and Pb x O −1+ x dominate the mass spectra of Pb x reactions with NO2, showing that the products fragment to more stable oxides. No reaction with oxygen was observed for any cluster, setting upper limits on the rates of 5 × 10−14 cm3/s.
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Farley, R.W., Ziemann, P.J., Keesee, R.G. et al. Kinetic study of neutral lead cluster reactions. Z Phys D - Atoms, Molecules and Clusters 25, 267–273 (1993). https://doi.org/10.1007/BF01426890
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DOI: https://doi.org/10.1007/BF01426890