Our research is done at many facilities.

Northwestern University

Currently, we have experimental setups to conduct 2D electronic spectroscopy, two-color broadband transient absorption (TA) spectroscopy, femtosecond white-light TA, time-resolved fluorescence upconversion, time-correlated single-photon counting (fluorescence lifetime measurement), and nanosecond TA.

Laser lab overview

Inteferometer setup of 2D spectrometer

Schematic illustration

2D spectrometer at work

Noncollinear Optical parametric amplifier (NOPA) for generating tunable laser light

Argonne National Laboratory

We have a laser lab at Argonne where we conduct optical TA and terahertz spectroscopies. At the user facilities at Advanced Photon Source (APS), we conduct a wide range of X-ray related experiments. These include X-ray transient absorption (11-ID-D), time-resolved X-ray diffraction (11-ID-D), time-resolved X-ray solution scattering (14-ID-B), grazing-incidence wide-angle X-ray scattering (8-ID), and much more.

The normal TA setting at Argonne laser lab Terahertz setting
Nanosecond TA setting

Ryan and Dugan checking sample environment at beamline 11-ID-D X-ray hutch.

Sample chamber at 11-ID-D with laser excitation, viewed from downstream of X-ray path.

Beamline 14-ID-D X-ray hutch with SAXS setup

Beamline 14-ID-B X-ray hutch and prototype of XES spectrometer

X-ray Free Electron Lasers

Since APS provides 100 ps pulses, events faster than that requires shorter probe pulses. At these user facilities that generate 50 fs pulses, we study femtosecond dynamics of the molecules with X-ray transient absorption, emission, and solution scattering.

Megan Shelby, Mike Mara, and Andy Stickrath (left to right) work on the sample delivery system at the XPP beamline at LCLS (Stanford), 2012.

The FXE beamline at European XFEL (Hamburg), 2017. Shown here are the X-ray hutch, photon diagnostic equipment, and the X-ray tunnel.

The beamline staff and our group at XCS beamline conducting time-resolved X-ray solution scattering experiment, 2018.