Probing the ground-state structural transition in small lithium clusters by quantum Monte Carlo simulations
B G A Brito1, E L Verde2, G-Q Hai3
1Departamento de Física, Instituto de Ciências Exatas e Naturais e Educação (ICENE), Universidade Federal do Triângulo Mineiro - UFTM, 38064-200, Uberaba, MG, Brazil.
Journal of Molecular Modeling
|June 25, 2021
Summary
The study reveals how small lithium clusters (Li4-6) transition from 2D to 3D structures. This shift is driven by a balance of attractive and repulsive forces, with electron correlation playing a key role.
Area of Science:
- Computational Chemistry
- Materials Science
- Quantum Mechanics
Background:
- Understanding the structural evolution of small metal clusters is crucial for predicting their properties.
- Lithium clusters exhibit complex ground-state structures that are challenging to determine experimentally.
Purpose of the Study:
- To analyze the ground-state structural transition in lithium clusters (Li4-6).
- To investigate the energetic contributions governing the 2D to 3D structural change.
Main Methods:
- Utilized the many-body expansion of interaction energy.
- Employed fixed-node diffusion Monte Carlo (FN-DMC) simulations to calculate total energies.
Main Results:
- The transition from 2D to 3D structures in Li4-6 clusters is characterized by a complex interplay of attractive and repulsive forces.
- Electron-correlation energy is identified as the dominant contribution to the interaction energy in the ground-state isomers.
Conclusions:
- The structural transition is not solely driven by one type of interaction but a delicate balance.
- Electron correlation significantly influences the stability and structure of small lithium clusters.
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