Sefton Hamann

Distinguished for contributions to the effect of high pressure on chemical reactions and physical properties of matter; and to the theory of intermolecular forces in fluids. The effect of pressure on ionic reactions - whether organic or inorganic - are traced to solvation and consequent stabilisation of ions. Novel techniques using explosives has transformed non-metals to metals and some properties of liquids were measured under conditions of pressure shock up to 300,000 atmospheres. Hamann's approach to intermolecular forces between molecules has been elegantly direct and has led, inter alia, to recognition of quantal effects on the pressure-volume relations of hydrogen and helium.

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