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Environment

What About Ahmed Zewail?

December 2, 2013 | A version of this story appeared in Volume 91, Issue 48
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The poster “How Chemistry Changed the World,” published in the landmark 90th anniversary edition (C&EN, Sept. 9), should have included Ahmed Zewail and coworkers’ seminal papers (J. Chem. Phys. 1987,87, 2395; Science 1988, 241,1200) reporting the first recording of the time—on the order of a few hundred femtoseconds—it takes for a chemical bond to break. Zewail and company also detected and measured the lifetime of a hitherto hypothetical species, the elusive transition state.

Rama Viswanathan
Beloit, Wis.

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