Structural relaxation in atomic clusters: master equation dynamics.
The role of the potential energy landscape in determining the relaxation dynamics of model clusters is studied using a master equation. Two types of energy landscape are examined: a single funnel, as exemplified by 13-atom Morse clusters, and the double funnel landscape of the 38-atom Lennard-Jones...
| Главные авторы: | , , |
|---|---|
| Формат: | Journal article |
| Язык: | English |
| Опубликовано: |
American Physical Society
1999
|
| _version_ | 1826284836517576704 |
|---|---|
| author | Miller, M Doye, J Wales, D |
| author_facet | Miller, M Doye, J Wales, D |
| author_sort | Miller, M |
| collection | OXFORD |
| description | The role of the potential energy landscape in determining the relaxation dynamics of model clusters is studied using a master equation. Two types of energy landscape are examined: a single funnel, as exemplified by 13-atom Morse clusters, and the double funnel landscape of the 38-atom Lennard-Jones cluster. Interwell rate constants are calculated using Rice-Ramsperger-Kassel-Marcus theory within the harmonic approximation, but anharmonic model partition functions are also considered. Decreasing the range of the potential in the Morse clusters is shown to hinder relaxation toward the global minimum, and this effect is related to the concomitant changes in the energy landscape. The relaxation modes that emerge from the master equation are interpreted and analyzed to extract interfunnel rate constants for the Lennard-Jones cluster. Since this system is too large for a complete characterization of the energy landscape, the conditions under which the master equation can be applied to a limited database are explored. Connections are made to relaxation processes in proteins and structural glasses. |
| first_indexed | 2024-03-07T01:19:49Z |
| format | Journal article |
| id | oxford-uuid:8ff1c9ea-bb7c-4560-9d26-00a2f4c6de9a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:19:49Z |
| publishDate | 1999 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:8ff1c9ea-bb7c-4560-9d26-00a2f4c6de9a2022-03-26T23:08:04ZStructural relaxation in atomic clusters: master equation dynamics.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8ff1c9ea-bb7c-4560-9d26-00a2f4c6de9aEnglishSymplectic Elements at OxfordAmerican Physical Society1999Miller, MDoye, JWales, DThe role of the potential energy landscape in determining the relaxation dynamics of model clusters is studied using a master equation. Two types of energy landscape are examined: a single funnel, as exemplified by 13-atom Morse clusters, and the double funnel landscape of the 38-atom Lennard-Jones cluster. Interwell rate constants are calculated using Rice-Ramsperger-Kassel-Marcus theory within the harmonic approximation, but anharmonic model partition functions are also considered. Decreasing the range of the potential in the Morse clusters is shown to hinder relaxation toward the global minimum, and this effect is related to the concomitant changes in the energy landscape. The relaxation modes that emerge from the master equation are interpreted and analyzed to extract interfunnel rate constants for the Lennard-Jones cluster. Since this system is too large for a complete characterization of the energy landscape, the conditions under which the master equation can be applied to a limited database are explored. Connections are made to relaxation processes in proteins and structural glasses. |
| spellingShingle | Miller, M Doye, J Wales, D Structural relaxation in atomic clusters: master equation dynamics. |
| title | Structural relaxation in atomic clusters: master equation dynamics. |
| title_full | Structural relaxation in atomic clusters: master equation dynamics. |
| title_fullStr | Structural relaxation in atomic clusters: master equation dynamics. |
| title_full_unstemmed | Structural relaxation in atomic clusters: master equation dynamics. |
| title_short | Structural relaxation in atomic clusters: master equation dynamics. |
| title_sort | structural relaxation in atomic clusters master equation dynamics |
| work_keys_str_mv | AT millerm structuralrelaxationinatomicclustersmasterequationdynamics AT doyej structuralrelaxationinatomicclustersmasterequationdynamics AT walesd structuralrelaxationinatomicclustersmasterequationdynamics |