K S Krishnan and the early experimental evidences for the Jahn-Teller Theorem

Details K S Krishnan and the early experimental evidences for the Jahn-Teller Theorem K S Krishnan and the early experimental evidences for the Jahn-Teller Theorem

1999-06-13

arxiv.org/abs/cond-mat/9906184v1

Current Science (Bangalore) vol.75, pp.1254-1258, 1998 (K S Krishnan Birth Centenary Section)

Physics

Condensed Matter

3 pages, LaTex version

Scientific paper

Jahn-Teller theorem, proposed in 1937, predicts a distortional instability for a molecule that has symmetry based degenerate electronic states. In 1939 Krishnan emphasized the importance of this theorem for the arrangement of water molecules around the transition metal or rare earth ions in aqueous solutions and hydrated saltes, in a short and interesting paper published in Nature by pointing out atleast four existing experimental results in support of the theorem. This paper of Krishnan has remained essentially unknown to the practitioners of Jahn-Teller effect, eventhough it pointed to the best experimental results that were available, in the 30's and 40's, in support of Jahn-Teller theorem. Some of the modern day experiments are also in conformity with some specific suggestions of Krishnan.

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