The Forces Between Hydrogen Molecules

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Abstract
A quantitative calculation is made of the entire interaction called into play when two hydrogen molecules approach. The forces consist of three parts: exchange, quadrupole, and dispersion (van der Waals) forces. By compounding these, it is possible to account in a fundamental way for the size and the shape of the molecules. Also, the interaction curves (Fig. 2) are in reasonable agreement with empirical curves derived from second virial coefficients. Because of the complexity of the exchange force calculation, a simple state function of the Wang type (but with undetermined screening constant) was used in this work to represent the charge distribution within the molecule. Quadrupole moments are computed (Table V), and comments are made on the relation between the molecular problem treated in this paper, and the corresponding atomic problem (interaction between helium atoms).

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