### Session J27: Focus Session: X-ray and Neutron Instruments and Sciences I

11:15 AM–1:51 PM, Tuesday, March 17, 2009
Room: 329

Chair: Albert Macrander, Argonne National Laboratory

Abstract ID: BAPS.2009.MAR.J27.6

### Abstract: J27.00006 : X-ray Diffuse Scattering from Ultrafast Laser Excited Solids

12:39 PM–12:51 PM

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#### Authors:

Mariano Trigo
(University of Michigan)

Yu-Miin Sheu
(University of Michigan)

Jian Chen
(University of Michigan)

David Reis
(University of Michigan)

Stephen Fahy
(University College, Cork, Ireland)

Eamonn Murray
(University College, Cork, Ireland)

Timothy Graber
(University of Chicago)

Robert Henning
(University of Chicago)

Intense, ultrashort laser pulses can be used to excite and detect coherent phonons in solids. However, optical experiments can only probe a reduced fraction of the Brillouin zone and hence most of the decay channels of such coherent phonons become invisible. In contrast, time-resolved x-ray diffuse scattering (TRXDS) has the potential to be the ultimate tool to study these phonon decay processes throughout the Brillouin-zone of the crystal.~ In our work, performed at the BioCARS beamline at the Advanced Photon Source, we use synchrotron time-resolved diffuse x-ray scattering to study Si and Bi under intense laser excitation with 100 ps resolution. We show that reasonable signal levels can be achieved with incident flux of 10$^{12}$ photons comparable to the flux that will be available at future 4th generation sources such as the LCLS in a single pulse.~ These sources will also provide three orders of magnitude shorter pulses; thus, this experiment serves as a test of the feasibility of time-resolved X-ray diffuse scattering as a tool for studying nonequilibrium phonon dynamics in solids.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.J27.6