Impulsive Stimulated X-ray Raman Scattering in Molecular Systems
POSTER
Abstract
The field of nonlinear X-ray interactions is growing with technological advances at free-electron lasers. The development of intense attosecond X-ray pulses has opened a new regime for studying nonlinear X-ray interactions in the impulsive limit. In an experiment conducted at the Linac Coherent Light Source, we made the first observation of impulsive stimulated X-ray Raman scattering~(ISXRS) in a molecular system, finding a two-photon cross section of~$\left(3\pm2\right)\times10^{-55}$~cm$^4$s/photon. ISXRS is a versatile process for studying electronic charge motion and X-ray-matter interactions. Simulations matching the observed signal show that ISXRS coherently populates multiple valence-excited electronic states. This is a significant step toward direct observation of coherent electronic wavepackets using the planned 2-color attosecond X-ray mode of the LCLS.
*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.