XPP (X-ray Pump Probe)

NOTE: The XPP Instrument is not available during Run 25 as it is undergoing an upgrade for LCLS-II-HE.

The 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.

For more information about the XPP instrument, please read the following article:

• Chollet et al. The X-ray Pump-Probe instrument at the Linac Coherent Light Source. J. Synchrotron Rad. (2015), 22, 503-507​

XPP Location

Near Experimental Hall (NEH), Hutch 3

See complete instrument map

XPP Videos

For more XPP related videos, see the LCLS XPP playlist on YouTube.

Download flyover animation (right click and save link as):

mp4  (16.3 MB)