What is the change of variables for Lennard-Jones potential?

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SUMMARY

The discussion centers on the change of variables for the Lennard-Jones potential, specifically the transformation using the unitless variable X defined as X = r/σ. Participants clarify that substituting r/σ with X in the Lennard-Jones potential equation is a straightforward change of variables rather than a proof. The conversation emphasizes the importance of understanding the implications of this substitution in the context of the potential's mathematical formulation.

PREREQUISITES
  • Understanding of the Lennard-Jones potential formula
  • Familiarity with unitless variables in mathematical physics
  • Basic knowledge of variable substitution techniques
  • Proficiency in algebraic manipulation of equations
NEXT STEPS
  • Study the derivation of the Lennard-Jones potential equation
  • Explore the implications of unitless variables in physical equations
  • Learn about variable substitution in calculus and its applications
  • Investigate the physical significance of parameters like σ in molecular interactions
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Students and researchers in physics, particularly those focusing on molecular dynamics and potential energy calculations, will benefit from this discussion.

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Homework Statement


[PLAIN]http://img94.imageshack.us/img94/4287/len2.jpg

Homework Equations


[PLAIN]http://img710.imageshack.us/img710/2428/len1y.jpg


The Attempt at a Solution


I know my way around the Lennard-Jones potential formula, but this question stumps me.

Any clues on how to proceed are greatly thanked!
 
Last edited by a moderator:
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Just define a new unitless variable as X=r/\sigma.
 
nickjer said:
Just define a new unitless variable as X=r/\sigma.


I used your defined variable and plugged it in, but still cannot arrive at the proof given in the question, could you possibly expand further?

Thank you!
 
I wouldn't call that a proof. You are just doing a change of variables. You can replace r/\sigma with X in the above equation. Unless 'X' has a meaning that I am unaware of.
 

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