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An Office of Science User Facility

X-ray Pump Probe (XPP)

This site is OBSOLETE as of 30 Oct. 2017
Please go to the new XPP site


XPP Home



The XPP instrument  


At the X-ray pump-probe (XPP) instrument predominantly uses ultrashort optical laser pulses to generate transient states of matter which are subsequently probed by hard X-ray pulses from the LCLS. The X-ray pulses help to reveal structural dynamics initiated by the laser excitatio​n at the timescale of atomic motions in solid, liquid and gaseous specimens. 
The instrument design emphasizes versatility. To maximize the range of phenomena that can be excited and studied, the laser pulse energy, frequency, and temporal profile can be matched to the scientific problem. X-ray absorption and emission spectroscopy, diffraction and scattering are typical tools for probing the laser-induced structural changes. These experiments require the union of four experimental capacities: the generation and delivery of X-ray and laser pulses to the sample, the preparation of the excited state in the sample, and the detection of the X-ray signal.

For more information about the instrument see here:

XPP Location

Near Experimental Hall (NEH), Hutch 3 » map
XPP is located in the Near Experimental Hall, hutch 3.  ​​

XPP, Near Experimental Hall, Hutch 3  ​​​​​​

XPP Contact Information
 Name: Diling Zhu
 Title: Scientist
 Phone: (650) 926-2913

 Name: Roberto Alonso-Mori
 Title: Scientist
 Phone: (650) 926-4179

 Name: Matthieu Chollet
 Title: Scientist
 Phone: (650) 926-2458

 Name: Takahiro Sato
 Title: Scientist
 Phone: (650) 926-3749

 Name: Sanghoon Soog
 Title: Scientist
 Phone: (650) 926-2255

 Name: Daniel Stefanescu
 Title: XPP Area Manager
 Phone: (650)926-3662

 Name: Sebastien Boutet
 Title: Department Head
 Phone: (650)926-8676

XPP Control Room: (650) 926-1703
XPP Hutch: (650) 926-7963

XPP Animation (More videos)

XPP Image Gallery (More images)

XPP Instrument Image

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy