Time Domain Phonon Spectroscopy at LCLS

Program Description

Fourier-transform inelastic x-ray scattering is a novel technique enabled by the high flux of the LCLS for measuring phonon dispersions and more in crystalline solids. Following a short optical pump, we observe phonon coherences throughout the Brillion zone via scattering of a non-resonant femtosecond x-ray probe. I will show recent measurements that have improved our understanding of the generation mechanism of these coherences. I will also argue that this technique can access information inaccessible via more traditional inelastic scattering. In particular, that it is possible to measure not only the spectra of excitations in solids, but the interactions between excitations.

Bio

Tom Henighan completed his Bachelor’s in Engineering Physics at The Ohio State University in 2010. He is currently a PhD student in the Stanford physics department under the direction of David Reis here at SLAC.