25th International Congress of Pure and Applied Chemistry. by Y. Marcus

By Y. Marcus

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Extra resources for 25th International Congress of Pure and Applied Chemistry. Plenary Lectures Presented at the 25th International Congress of Pure and Applied Chemistry, Jerusalem, Israel 6–11 July 1975

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Under these circumstances (until, and if, fusion reactors ever become both possible and economic) there are only two other sources of energy which could be developed: the solar and the solar-gravitational sources. There has been misunderstanding concerning the gathering of electrical energy from the sun. The conven­ tional treatment pictures the cost of converting photons to electrons as impossibly high (100-1000 times greater than that of fossil fuels), but this view is archaic. The method usually indicated in discussions of solar energy is the photovoltaic method, largely because this is the one hitherto proven.

O'M. and development in this field which would have to be done could not be carried put in such a short time. (2) Independently of the time element, it is advantage­ ous to have a greater distance between the source of the energy and the site of use. This conclusion arises for two reasons: (a) If the sources are fission and fission-breeder atomic reactors, there is a pollutional problem and a large distance between the source and sink is necessary. If the reactor is very large (and hence its product very cheap), it may not be practical to take the electricity over the distance concerned in wires: it would have to be taken in hydrogen, or another chemical fuel, perhaps methanol.

Wittcofski, 1th Intersociety Energy Conf. San Diego (Sept. 1972). 51 J. V. Beeker, Astronautics and Aeronautics, 9 (8), 32 (1971). Pure & Appi. , Vol. 47, pp. 41-47. Pergamon Press, 1976. Printed in Great Britain. FIFTY YEARS OF QUANTUM CHEMISTRY E. , Cambridge, MA 02138, USA Abstract—An assessment of some aspects of the impact of quantum mechanics on chemistry will be attempted, with emphasis on the different ways it has had an important influence. These include a change in the chemists' vocabulary, his way of looking at molecules and reactions, the instruments and methods he uses, the psychological satisfaction he gets from his subject, the procedures he uses to describe and to rationalize his results, as well as direct, partly predictive theories and numerical calculations.

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