Abstract
We present the first results on experimentally measured ultrafast X-ray scattering of strongly driven molecular iodine and analysis of high-order anisotropic components of the scattering signal. We discuss the technical details of retrieving high fidelity high-order anisotropy components from the measured scattering data and outline a method to analyze such signals using Legendre decomposition. We describe how anisotropic motions can be extracted from the various Legendre orders using simulated anisotropic scattering signals and Fourier analysis. We implement the method on the measured signal and observe a multitude of dissociation and vibration motions simultaneously arising from various multiphoton transitions occurring in the sample. We use the anisotropic scattering information to disentangle the different processes and assign their dissociation velocities on the Angstrom and femtosecond scales de novo.
| Original language | English |
|---|---|
| Pages (from-to) | 123-138 |
| Number of pages | 16 |
| Journal | Faraday Discussions |
| Volume | 228 |
| DOIs | |
| State | Published - 27 May 2021 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2021 The Royal Society of Chemistry.
Funding
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. The experiment described was carried out at the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory. LCLS is an Office of Science User Facility operated for the U.S. Department of Energy Office of Science by Stanford University.
| Funders |
|---|
| U.S. Department of Energy |
| Office of Science |
| Basic Energy Sciences |
| Chemical Sciences, Geosciences, and Biosciences Division |