Development of a Structural Comparison Method to Promote Exploration of the Potential Energy Surface in the Global Optimization of Nanoclusters
| Autor: | Geoffrey R. Weal, Samantha M. McIntyre, Anna L. Garden |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
education.field_of_study
Mathematical optimization Similarity (geometry) 010304 chemical physics Computer science General Chemical Engineering Population General Chemistry Library and Information Sciences 01 natural sciences Measure (mathematics) 0104 chemical sciences Computer Science Applications Physical Phenomena 010404 medicinal & biomolecular chemistry Operator (computer programming) 0103 physical sciences Potential energy surface Genetic algorithm Thermodynamics education Global optimization Energy (signal processing) Algorithms |
| Zdroj: | Journal of chemical information and modeling. 61(4) |
| ISSN: | 1549-960X |
| Popis: | A structural comparison method (SCM) was created to quantify the structural diversity of nanoclusters and was implemented into a global optimization algorithm to evaluate structural diversity between generated clusters on the fly and promote exploration of the potential energy surface. The SCM evaluated topological differences between clusters using the common neighbor analysis and provided a numerical measure of similarity between the two clusters. The SCM was implemented into a genetic algorithm by integrating it into a new structure + energy fitness operator such that structural diversity of clusters in the population and their energies were used to assign fitness values to clusters. The efficiency of the genetic algorithm with this new fitness operator was benchmarked against several Lennard-Jones clusters (LJ38, LJ75, and LJ98) known to be difficult cases for global optimization algorithms. For LJ38 and LJ75, this new structure + energy fitness operator performed equally well or better than the energy fitness operator. However, the efficiency of locating the global minimum of LJ98 decreased using this new structure + energy fitness operator. Further analysis of the genetic algorithm with this fitness operator showed that the algorithm did indeed promote exploration of the PES of LJ98 as desired but hindered refinement of clusters, preventing it from locating the global minimum even if the energy funnel of the global minimum had been located. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|