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Configuration integral

 
Wikipedia: Configuration integral

The classical configuration integral, more commonly called the partition function, and sometimes referred to as the configurational partition function[1], for a system with \displaystyle N particles is defined as follows:


   \displaystyle 
   Z_N
   :=
   \int\limits_V
      \exp
      \left[ 
	 - \beta U (x_1 , \cdots , x_N)
      \right] 
   d^3 x_1 \cdots d^3 x_N

(1)

where \displaystyle V is the volume enclosing the \displaystyle N particles, \displaystyle \beta a constant defined as


   \displaystyle 
   \beta
   :=
   \frac
   {1}
   {k_B T}

(2)

with \displaystyle k_B being the Boltzmann constant \displaystyle T the thermodynamic temperature \displaystyle U the potential energy of interparticle forces, \displaystyle \{ x_1 , \cdots , x_N \} the positions in the 3-D space \displaystyle \mathbb R ^3 of the \displaystyle N particles, with \displaystyle x_i = (x_i^1 , x_i^2 , x_i^3) and \displaystyle x_i^j the \displaystyle jth coordinate of the \displaystyle ith particle, and \displaystyle d^3 x_i = d x_i^1 d x_i^2 d x_i^3 an infinitesimal volume. The configuration integral has many applications from the ligand-receptor binding affinity in biochemistry to turbulence in fluid mechanics. For a detailed derivation, see the comprehensive article[2].

References

  1. ^ See, e.g., K. Lucas, Molecular Models for Fluids, Cambridge University Press, 2007 (p.270, Read from Google Book).
  2. ^ Vu-Quoc, Loc. "Configuration_integral_(statistical_mechanics)". http://clesm.mae.ufl.edu/wiki.pub/index.php/Configuration_integral_(statistical_mechanics). Retrieved 2008-10-12. 

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Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Configuration integral" Read more