Nonsequential two-photon absorption from the K shell in solid zirconium

Shambhu Ghimire,1,* Matthias Fuchs,2 Jerry Hastings,3 Sven C. Herrmann,4 Yuichi Inubushi,5 Jack Pines,4 Sharon Shwartz,6 Makina Yabashi,5 and David A. Reis1,7,† 1Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA 2Department of Physics and Astronomy, University of Nebraska – Lincoln, Lincoln, Nebraska 68588, USA 3The Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA 4SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA 5RIKEN SPring-8 Center, Kouto 1-1-1 Sayo, Hyogo 679-5148, Japan 6Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan 52900, Israel 7Departments of Photon Science and Applied Physics, Stanford University, Stanford, California 94305, USA (Received 27 July 2016; published 21 October 2016)