A SITE SITE BORN-GREEN-YVON EQUATION FOR HARD-SPHERE DIMERS

A Born-Green-Yvon (BGY) integral equation approach is used to study th e structure and thermodynamics of a fluid of fused hard sphere dimers. Starting from a BGY equation for the dimer molecular pair distributio n function, an equation for the simpler site-site distribution is deri ved. The multisite distribution functions appearing in this latter equ ation are related to the site-site function via a set of superposition approximations. Detailed results are presented for dimers with bond l engths of L = 0.6sigma and 1.0sigma (where sigma is the hard sphere si te diameter). These results, which include the site-site distribution function over a range of densities, as well as the virial and compress ibility pressure equations of state, are compared with analytic and Mo nte Carlo results.