SQUARE-WELL DIATOMICS - EXACT LOW-DENSITY RESULTS

Exact semi-analytical expressions are obtained for the zero density si te-site distribution function and the second virial coefficient for ho monuclear square-well diatomics. The diatomic molecules considered her e are composed of two fused square-well spheres with hard core diamete r sigma, well diameter lambda sigma, and dimer bond length L, such tha t O < L less than or equal to sigma and 1 less than or equal to lambda less than or equal to 1 + L/sigma. Very accurate, although approximat e, analytical expressions are also given for these functions.