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An Office of Science User Facility

X-ray Pump Probe (XPP)

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 excitation 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.

XPP Location

Near Experimental Hall (NEH), Hutch 3 » map
XPP is located in the Near Experimental Hall, hutch 3.  ​
XPP Contact Information
 Name: Diling Zhu
 Title: XPP Instrument Scientist
 Phone: (650) 926-2913

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

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

 XPP Hutch 3: Phone 7463 
 XPP Control room 3: Phone 7965 

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