Inside Cover: Hydrogen‐Atom Tunneling Could Contribute to H2Formation in Space (Angew. Chem. Int. Ed. 40/2010)

The role of quantum tunnelingof hydrogen atoms in the formation of dihydrogen in space has been investigated. In their Communication on page 7350 ff.,T.P.M. Goumans and J. Kästner use a novel implementation of harmonic quantum transition‐state theory to study the reaction rate of hydrogen atoms with benzene. This model of the rate‐limiting step of H2formation on carbonaceous dust grains in space shows that hydrogen reacts about two orders of magnitude faster than the heavier deuterium. Background image: NASA/JPL‐Caltech/STScI/CXC/UofA/ESA/AURA/JHU.