Constants in Lenard Jones Potential

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SUMMARY

The discussion focuses on obtaining the Lennard-Jones (LJ) potential constants, specifically A and B or Sigma and Gamma, for various molecules and solids. Key resources include solid-state physics textbooks and scientific article search engines. The LJ potential is primarily applicable for simulating liquids or noble gases, and if specific constants are unavailable, users can derive them through potential parametrization based on nearest neighbor distances and energy per atom for dimers.

PREREQUISITES
  • Understanding of Lennard-Jones potential and its application in molecular simulations
  • Familiarity with solid-state physics concepts
  • Knowledge of potential parametrization techniques
  • Experience using scientific article search engines for research
NEXT STEPS
  • Research Lennard-Jones potential constants for specific molecules using scientific databases
  • Explore solid-state physics textbooks that cover the Lennard-Jones potential in detail
  • Learn about potential parametrization methods for molecular simulations
  • Investigate simulation software that utilizes Lennard-Jones potential, such as LAMMPS or GROMACS
USEFUL FOR

This discussion is beneficial for computational chemists, materials scientists, and researchers involved in molecular dynamics simulations who require accurate Lennard-Jones potential constants for their studies.

Tanja
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Does anybody know where I can find the value for the Lenard Jones potential constants (sometimes denotes as A and B, sometimes as Sigma and Gamma) for specific molecules and/or solids?
 
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Generally,
(1) you look in any solid-state physics textbook that discusses the LJ potential,
(2) you search in a scientific articles search engine for articles.

I guess you want to simulate liquids or noble gases, or you are more interested in the dynamics of atoms rather than the material itself. Other than that, there's no point using LJ potential.

If (1) and (2) turns out a blank for the molecule you want to simulate, then you can do a simple potential parametrization depending on what you want to simulate eg. sigma = nearest neighbour distance of your molecule, epsilon is energy per atom for dimer .
 

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