25 June 2010
Vol 328, Issue 5986

About The Cover

Cover image expansion

COVER Three-dimensional representation of the emission of electrons from a neon atom upon absorption of a photon from an attosecond extreme ultraviolet pulse. The orange surface plot represents the resulting electron energy distribution, which, when probed by an ultrashort light wave (yellow line), reveals an unexpected time delay between the emission of electrons from different atomic orbitals. See page 1658. Image: Christian Hackenberger/Ludwig-Maximilians-Universität, Munich, Germany