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• W1592095146 abstract "Theoretical studies have predicted that the extreme conditions produced within a cluster during cluster-surface scattering could catalyze multicenter reactions with large activation barriers. However, recent experimental results did not reveal vibrational excitation or molecular dissociation in the scattering of molecular van der Waals clusters on a graphite surface. Building on our previous investigations of translational and rotational excitation, we carried out a detailed study of the mechanisms of energy transfer to the vibrational degrees of freedom of the products of (N2)n and (O2)n cluster-surface scattering by means of molecular dynamics simulations. Our results indicate that the monomer product vibrational energy distributions are best fit by a sum of two Boltzmann distributions, which suggests that two distinct thermal-like processes of vibrational excitation may be occurring during cluster scattering. The cold component of the distribution was shown to involve monomers originating from the cluster interior while the hot component of the distribution is made up of monomers essentially lying at the outskirts of the cluster at surface impact. Under current experimental conditions, cluster products are found to be only slightly vibrationally excited. Only a small fraction of the incident cluster kinetic energy is transferred to the monomer product vibrational modes, such that molecular dissociation is not possible under typical experimental conditions, and a much larger incident kinetic energy is required to obtain a significant probability of surface-induced monomer dissociation. Furthermore, our results indicate that increasing cluster size does not catalyze, but rather hinders monomer vibrational excitation, and enhances vibrational relaxation. Our findings suggest the existence of an optimal cluster size for experimental studies of cluster-catalyzed reactions." @default.
• W1592095146 created "2016-06-24" @default.
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• W1592095146 date "2003-09-26" @default.
• W1592095146 modified "2023-09-26" @default.
• W1592095146 title "Molecular dissociation and vibrational excitation in the surface scattering of (N2)n and (O2)n clusters" @default.
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• W1592095146 doi "https://doi.org/10.1063/1.1597199" @default.
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