Author Affiliations

T. J. A. Wolf,¹ R. H. Myhre,^1,2 S. Coriani,³ H. Koch,^1,2 A. Battistoni,¹ N. Berrah,⁴ P. Bucksbaum,^1,5 R. Coffee,⁶ G. Coslovich,⁶ J. P. Cryan,¹ R. Feifel,⁷ K. Gaffney,¹ J. Grilj,⁸ T. J. Martinez,^1,9 S. Myabe,^1,9 S. P. Moeller,⁶ M. Mucke,¹⁰ A. Natan,¹ R. Obaid,⁴ T. Osipov,⁶ O. Plekan,¹¹ A. Sage,⁴ R. Squibb,⁷ S. Wang,¹ and M. Gühr^1,12

¹Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

²Department of Chemistry, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway

³Dipartimento di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, Italy

⁴Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA

⁵Department of Physics, Stanford University, Stanford, CA 94305, USA

⁶Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA

⁷Department of Physics, University of Gothenburg, Gothenburg, Sweden

⁸Laboratory of Ultrafast Spectroscopy, Ecole Polytechnique Federal de Lausanne, CH 1015 Switzerland

⁹Department of Chemistry, Stanford University, Stanford, California 94305, USA

¹⁰Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden

¹¹Elettra-Sincrotrone Trieste, I-34149 Basovizza, Trieste, Italy

¹²Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm, Germany

For codes, see http://www.osapublishing.org/submit/ocis/