An angle dependent site-renormalized theory for the conformations of n-butane in a simple fluid

• Main Authors: K.Dyer, J.Perkyns, B.Pettitt, G.Stell
• Format: Article
• Language: English
• Published: Institute for Condensed Matter Physics 2007-09-01
• Series: Condensed Matter Physics
• Subjects: liquid structure; integral equations; rotameric states
• Online Access: http://dx.doi.org/10.5488/CMP.10.3.331

The angular dependent site-renormalized integral equation theory is developed to compute the dihedral conformation distribution and intermolecular pair distributions of n-butane at infinite dilution in a Lennard-Jones solvent. The equations take advantage of the topological diagrammatic expansion of the full angular dependent molecular system by resumming the series in conjunction with the intramolecular degree of freedom. To first order in an angular basis set, the numerical results of these site-renormalized equations are a systematic quantitative improvement over previousmethods. In paicular, the thermodynamics and conformational distribution of the solute are essentially indistinguishable from simulation.