Forces between Non-polar, Spherical Molecules

Intennolecular Forces Between Non-polar, Spherical Molecules 

We shall now summarize our present information about intennolecular forces between simple molecules. We shall briefly deal with inter-molecular forces between like molecules but give more details about forces between unlike molecules ( 7-8). The standard textbook about intennolecular forces is Molecular Theory of Gases and Liquids by Hirschfelder, Curtiss and Bird [1954]. This textbook also gives a detailed account about the quantum theory of intermolecular forces which we shall not consider in this book. 

In this Chapter we consider non-polar, spherical molecules (like Ne, A, Kr, Xe, and also to a high approximation N2, CO, CH4 etc.) which interect according some intermolecular potential e r) which depends only on their distance apart r. 

Our knowledge about intermolecular forces comes mainly from three sources  

For molecules which satisfy the classical theorem of corresponding states (2.4.12), the virial coefficients B fi and CJcfi must be universal functions of the reduced temperature T. One may also consider the equivalent reduced quantities (2.4.13) and write 

---