Author Affiliations

Qing Li,^1,* Kathleen Hoogeboom-Pot,¹ Mark E. Siemens,² Margaret M. Murnane,¹ Henry C. Kapteyn,¹ Ronggui Yang,³ Erik H. Anderson,⁴ Olav Hellwig,⁵ Bruce Gurney,⁵ and Keith A. Nelson⁶

¹Department of Physics and JILA, University of Colorado and NIST, Boulder, CO

²Department of Physics and Astronomy, University of Denver, Denver, CO

³Department of Mechanical Engineering, University of Colorado, Boulder, CO

⁴Center for X-Ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA

⁵Hitachi Global Storage Technologies, San Jose, CA

⁶Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA

^*Corresponding author: qing.li@colorado.edu