Abstract
The analytic solution of the zero pole approximation (ZPA) for a homonuclear diatomic fluid interacting via site-site potentials having a hard core of diameter a and an attractive Yukawa tail is examined. Using the compressibility equation of state, the fluid is found to have a liquid-gas phase transition characterized by spherical model critical exponents. This behaviour is the same as that exhibited in the mean spherical approximation by the simple fluid analogue of the hard dumbell Yukawa fluid. The spinodal curve from the compressibility equation of state is discussed and found to exhibit a high degree of corresponding states behaviour for different elongations of the diatomic. The structure on the liquid and gas sides of the coexistence curve is calculated.
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