Condensation and dissociation rates for gas phase metal clusters from molecular dynamics trajectory calculations
Abstract
In gas phase synthesis systems, clusters form and grow via condensation, in which a monomer binds to an existing cluster. While a hard sphere equation is frequently used to predict the condensation rate coefficient, this equation neglects the influences of potential interactions and cluster internal energy on the condensation process. Here, we present a collision rate theory-Molecular Dynamics simulation approach to calculate condensation probabilities and condensation rate coefficients; we use this approach to examine atomic condensation onto 6-56 atom Au and Mg clusters. The probability of condensation depends upon the initial relative velocity (v) between atom and cluster and the initial impact parameter (b). In all cases there is a well-defined region of b-v space where condensation is highly probable, and outside of which the condensation probability drops to zero. For Au clusters with more than 10 atoms, we find that at gas temperatures in the 300-1200 K range, the condensation rate coefficient exceeds the hard sphere rate coefficient by a factor of 1.5-2.0. Conversely, for Au clusters with 10 or fewer atoms, and for 14 atom and 28 atom Mg clusters, as cluster equilibration temperature increases the condensation rate coefficient drops to values below the hard sphere rate coefficient.more »
- Authors:
-
- Univ. of Minnesota, Minneapolis, MN (United States)
- Publication Date:
- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1434278
- Alternate Identifier(s):
- OSTI ID: 1434402
- Grant/Contract Number:
- SC0018202
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 148; Journal Issue: 16; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; Clusters; Gas Phase Synthesis; Condensation
Citation Formats
Yang, Huan, Goudeli, Eirini, and Hogan, Christopher J. Condensation and dissociation rates for gas phase metal clusters from molecular dynamics trajectory calculations. United States: N. p., 2018.
Web. doi:10.1063/1.5026689.
Yang, Huan, Goudeli, Eirini, & Hogan, Christopher J. Condensation and dissociation rates for gas phase metal clusters from molecular dynamics trajectory calculations. United States. doi:https://doi.org/10.1063/1.5026689
Yang, Huan, Goudeli, Eirini, and Hogan, Christopher J. Tue .
"Condensation and dissociation rates for gas phase metal clusters from molecular dynamics trajectory calculations". United States. doi:https://doi.org/10.1063/1.5026689. https://www.osti.gov/servlets/purl/1434278.
@article{osti_1434278,
title = {Condensation and dissociation rates for gas phase metal clusters from molecular dynamics trajectory calculations},
author = {Yang, Huan and Goudeli, Eirini and Hogan, Christopher J.},
abstractNote = {In gas phase synthesis systems, clusters form and grow via condensation, in which a monomer binds to an existing cluster. While a hard sphere equation is frequently used to predict the condensation rate coefficient, this equation neglects the influences of potential interactions and cluster internal energy on the condensation process. Here, we present a collision rate theory-Molecular Dynamics simulation approach to calculate condensation probabilities and condensation rate coefficients; we use this approach to examine atomic condensation onto 6-56 atom Au and Mg clusters. The probability of condensation depends upon the initial relative velocity (v) between atom and cluster and the initial impact parameter (b). In all cases there is a well-defined region of b-v space where condensation is highly probable, and outside of which the condensation probability drops to zero. For Au clusters with more than 10 atoms, we find that at gas temperatures in the 300-1200 K range, the condensation rate coefficient exceeds the hard sphere rate coefficient by a factor of 1.5-2.0. Conversely, for Au clusters with 10 or fewer atoms, and for 14 atom and 28 atom Mg clusters, as cluster equilibration temperature increases the condensation rate coefficient drops to values below the hard sphere rate coefficient. Calculations also yield the self-dissociation rate coefficient, which is found to vary considerably with gas temperature. Finally, calculations results reveal that grazing (high b) atom-cluster collisions at elevated velocity (> 1000 m s-1) can result in the colliding atom rebounding (bounce) from the cluster surface or binding while another atom dissociates (replacement). In conclusion, the presented method can be applied in developing rate equations to predict material formation and growth rates in vapor phase systems.},
doi = {10.1063/1.5026689},
journal = {Journal of Chemical Physics},
number = 16,
volume = 148,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
Figures / Tables:

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