title: Thermodynamic curvature for attractive and repulsive intermolecular forces.
abstract: The thermodynamic curvature scalar R for the Lennard-Jones system is evaluated in phase space, including vapor, liquid, and solid state. We paid special attention to the investigation of R along vapor-liquid, liquid-solid, and vapor-solid equilibria. Because R is a measure of interaction strength, we traced out the line R=0 dividing the phase space into regions with effectively attractive (R<0) or repulsive (R>0) interactions. Furthermore, we analyzed the dependence of R on the strength of attraction applying a perturbation ansatz proposed by Weeks-Chandler-Anderson. Our results show clearly a transition from R>0 (for poorly repulsive interaction) to R<0 when loading attraction in the intermolecular potential.
authors.affiliation: University of Applied Sciences, Darmstadt, Germany, D-64295.
authors.forename: Helge-Otmar
authors.initials: HO
authors.lastname: May
authors.forename: Peter
authors.initials: P
authors.lastname: Mausbach
authors.forename: George
authors.initials: G
authors.lastname: Ruppeiner