Author Affiliations

J. Larsson,^1,2,* A. Lindenberg,² P.A. Heimann,³ P.H Bucksbaum,⁴ R.W. Lee,⁵ J.S. Wark,⁶ and R.W. Falcone²

¹Atomic Physics Division and Synchrotron Radiation Research Division, Lund University P.O. Box 118, S-221 00 Lund, Sweden, Phone +46 46 222 3099, Fax +46 46 222 42 50

²Physics Department, University of California at Berkeley, Berkeley, CA 94720, USA

³Advanced Light Source, AFRD, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

⁴Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109, USA

⁵Lawrence Livermore National Laboratory, Livermore, CA 94551, USA

⁶Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU

^*Corresponding author: jorgen.larsson@fysik.lth.se