Download PDF by Stuart A. Rice, Aaron R. Dinner: Advances in Chemical Physics, Volume 160

By Stuart A. Rice, Aaron R. Dinner

ISBN-10: 1119165148

ISBN-13: 9781119165149

The Advances in Chemical Physics sequence offers the chemical physics box with a discussion board for serious, authoritative reviews of advances in each sector of the self-discipline. This quantity explores the subsequent themes:

  • Thermodynamic Perturbation conception for Associating Molecules
  • Path Integrals and potent Potentials within the research of Monatomic Fluids at Equilibrium
  • Sponteneous Symmetry Breaking in subject brought on through Degeneracies and Pseudogeneracies
  • Mean-Field Electrostatics past the Point-Charge Description
  • First Passage procedures in mobile Biology
  • Theoretical Modeling of Vibrational Spectra and Proton Tunneling in Hydroen-Bonded Systems

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Additional info for Advances in Chemical Physics, Volume 160

Example text

O (1)(c AB (1) The reference system Helmholtz free energy is given as follows: Aref kB T 1 ln 1 3 1 d 1 o cref (63) (o) The reference system cref contains all of the graphs in Eq. (59) which are devoid of association bonds. Subtracting Eq. (63) from (58) we obtain the following: A Aref kB T o 1 ln 1 Q 1 1 1 d 1 o c (64) (o) The association graph sum c ( o ) c ( o ) cref contains all the graphs in Eq. (59) which contain association bonds.  7. Equation (64) provides a very general starting point for the statistical mechanics of associating fluids and is exact so long as the system is pairwise additive, and the intermolecular potential can be separated into a reference and association ­portion as in Eq.

This is due to the fact that when x(s) is small, there is an abundance of d molecules available to bond to the s molecules. As x(s) is increased, n decreases 42 BENNETT D. MARSHALL AND WALTER G. 8 1 x (s) Figure 16. 2 (circles, dashed curve) and 0 (triangles, solid curves). The figure is modified from Ref. 91. because there are less d molecules available for association due to a decreased fraction of d molecules and competition with other s molecules. Overall, theory and simulation are in good agreement.

The same approach has been applied using various weighted densities or fundamental measure theory with similar accurate agreement with molecular simulation. Still other studies have used gradient theory or a local density approximation for vapor–liquid interfaces and shown good agreement with interfacial tension data [92, 93, 101, 102]. Extensions of the weighted bulk association free energy approach of Segura et al. have resulted in an accurate DFT for polyatomic molecules [103–106] by taking the limit of complete association in the bulk as described earlier.

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Advances in Chemical Physics, Volume 160 by Stuart A. Rice, Aaron R. Dinner


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