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- W4283071503 endingPage "103316" @default.
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- W4283071503 abstract "Cinematographic recording of chemical reactions with transmission electron microscopy provides information unavailable by any other analytical methods. Studies have thus far remained mostly phenomenological, lacking information on the reactive species involved. To gain insight into the nature of the reactive species, we need to obtain kinetic information under various temperatures and variable acceleration voltages, i.e., electronic energy supply. We studied the mechanism of [2 + 2] dimerization of [70] fullerene in a carbon nanotube as an example. We describe herein a statistical analysis of individual reaction events of the dimerization that revealed dose-dependent first-order kinetics and voltage-dependent crossover from a singlet to a triplet mechanism, as highlighted by the pre-exponential factor (the frequency of excitation) that is a million times larger for the singlet reaction than for the triplet one. Comparison with the results of a recent study of [60] fullerene dimerization lets us propose that electron-impact excitation of the carbon nanotube is the first step, followed by energy transfer to fullerene molecules and their dimerization via an excited state. The results show that a variable-voltage kinetic study is indispensable for discussing the mechanism of chemical transformations under electron microscopic observation." @default.
- W4283071503 created "2022-06-19" @default.
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- W4283071503 date "2022-09-01" @default.
- W4283071503 modified "2023-10-16" @default.
- W4283071503 title "Excited state modulation of C70 dimerization in a carbon nanotube under a variable electron acceleration voltage" @default.
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- W4283071503 doi "https://doi.org/10.1016/j.micron.2022.103316" @default.
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