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By J. T. Clerc, H. Könitzer (auth.), Joachim Bargon (eds.)

The papers accumulated during this quantity have been awarded at a global symposium on Computational equipment in Chemistry. This symposium used to be backed by means of IBM Germany and used to be held September 17-19, 1979, in undesirable Neuenahr, West Germany. in keeping with Graham Richards [Nature 278, 507 (1979)] the "Third Age of Quantum Chemistry" has started-;-where the result of quantum chemical calculations became so exact and trustworthy that they could consultant the experimentalists of their look for the unknown. the actual instance highlighted through Richards used to be the suc­ cessful prediction and next identity of the relative energies, transition chances and geometries of the bottom triplet states of acetylene. The theoretical predictions have been established mainly upon the paintings of 3 teams: Kammer [Chern. Phys. Lett. ~, 529 (1970)] had made qualitatively right predictions; Demoulin [Chern. Phys. eleven, 329 (1975)] had calculated the aptitude power curves for the 2 lowest triplet states (3 and three ) of B A acetylene; and Wetmore and Schaefer III [J. Chern. Phys. ~~ 1648 (1978)] had made up our minds the geometries of the cis (3B and ~A ) and the trans (3B and 3A ) isomers of those sta~es. Inua 2 2 guided seek, Wendt, Hunziker and Hippler [J. Chern. PHys. 70, 4044 (1979)] succeeded to find the expected close to infrared absorption of the cis triplet acetylene (no corresponding absorp­ tion for the trans shape used to be discovered, that is in contract with theory), and the resolved constitution of the spectrum proven the expected geometries conclusively.

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