Author Affiliations

B.C. Walker,^#,$ Cs. Tóth,^#,* J.A. Squier,^#,** D. Fittinghoff,^#,* T. Guo,^#,** D.-E. Kim,^#,† K.R. Wilson,^#,** and C.P.I. Barty^#,*

^#Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 USA

^*Institute for Nonlinear Science

^**Department of Chemistry and Biochemistry, University of California, La Jolla, California 92093-0339 USA

^†Pohang University of Science and Technology, Pohang Kyungbuk 790-784, Korea

^$ bawalker@ucsd.edu