The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Time-Resolved Research (XSD-TRR)

The TRR group has operational responsibility for undulator end stations 7-ID-B, 7-ID-C, 7-ID-D, and 11-ID-D. Time-resolved pump-probe techniques using, most often, high-power lasers as the pump, are performed in stations 7-ID-C and 7-ID-D and 11-ID-D. 7-ID-B is white-beam capable and hosts experiments that probe ultrafast fluid dynamics in high-pressure, high velocity sprays.  In addition to the x-ray-beamlines, our group maintains and enhances high-power ultrafast laser systems at 7-ID and 11-ID.

7-ID-B is a white-beam-capable station primarily used for ultra-fast imaging of high density and high-speed sprays. Unique imaging capabilities include the ability to image the internal motion of operating fuel injectors and to perform single-x-ray-shot imaging of dense sprays.
7-ID-C has dedicated diffraction and nanoprobe diffraction set-ups that provide Å resolution (reciprocal space) ultrafast time-resolved measurements of pumped materials. Pumps include an ultrafast high-power laser beam with 1 kHz rep-rate, an available high-rep-rate (54 kHz - 6.5 MHz) high-power laser, and terahertz (THz) radiation. Typical x-ray-beam sizes are 50 μm for samples mounted on a large 6-circle Huber diffractometer while a new zone-plate set-up provides 300 nm resolution for samples mounted on a compact Huber diffractometer. A variety of sample environments are available. Work in this station is relevant to a fundamental understanding of excitations and phase diagrams of emerging complex materials.
7-ID-D is primarily devoted to pump-probe studies of ultrafast transient states of photoactive molecules in solution via the time-resolved incarnations of x-ray techniques such as XANES, EXAFS, x-ray emission (XES) spectroscopy and x-ray diffuse scattering (XDS). An ultrafast high-rep-rate (54 kHz - 6.5 MHz), high-power laser is typically used as the pump. Novel x-ray emission spectrometers are being developed and deployed that, combined with the high-rep-rate laser beams, allow the excited states of small and dilute quantities of designer photoactive molecules to be probed with high fidelity. Work performed in 7-ID-D is relevant to the fundamental understanding of photochemistry with ultimate application to artificial photosynthesis. Much of the work in this station is performed in collaboration with the CSE-AMO group.
11-ID-D provides laser-induced time-resolved (LITR) spectroscopic and scattering tools to probe electronic and structural changes along reaction pathways. These tools are used to probe complex hierachical systems with potential applications in areas of energy conversion/storage such as solar cells, light emitting devices, molecular machines, or catalytic systems.
Laser Systems
Specifications below provide general guidelines. Specific capabilities and requirements should be discussed with the beamline staff.
System Station Rep-rate Pulse
Wavelength Energy per
Ti:Sapph 7-ID-C, 7-ID-D 1 kHz 100 fs 800, 400 nm 200 μJ
Ti:Sapph with OPA 7-ID-C 1 kHz 100 fs 200nm - 20 μm 10 μJ
Duetto* 7-ID-D 54 kHz - 6.5 MHz 10 ps 1 or 0.5 μm 10 μJ
Ti:Sapph 11-ID-D 10 kHz 1.6 ps 800, 400, 266 nm 700 μJ
Ti:Sapph with OPA 11-ID-D 3 kHz 100 fs 260 nm-2.5 μm 100 μJ

*Portable system primarily operated and maintained by CSE-AMO in Station 7-ID-D. Available for use in other stations via collaboration or permission of CSE-AMO group and with appropriate safety considerations.