Photodissociation of aqueous I 3 - observed with liquid-phase ultrafast mega-electron-volt electron diffraction

Authors

K. Ledbetter, Stanford University
E. Biasin, SLAC National Accelerator Laboratory
J. P.F. Nunes, University of Nebraska–Lincoln
Martin Centurion, University of Nebraska - LincolnFollow
K. J. Gaffney, SLAC National Accelerator Laboratory
M. Kozina, SLAC National Accelerator Laboratory
M. F. Lin, SLAC National Accelerator Laboratory
X. Shen, SLAC National Accelerator Laboratory
J. Yang, SLAC National Accelerator Laboratory
X. J. Wang, SLAC National Accelerator LaboratoryFollow
T. J. A. Wolf, Stanford PULSE InstituteFollow
A. A. Cordones, Stanford PULSE InstituteFollow

ORCID IDs

K. Ledbetter, https://orcid.org/0000-0002-3961-8524

E. Biasin, https://orcid.org/0000-0002-7276-4224

J. P. F. Nunes, https://orcid.org/0000-0003-0670-6023

M. Centurion, https://orcid.org/0000-0002-5662-2293

K. J. Gaffney, https://orcid.org/0000-0002-0525-6465

M. Kozina, https://orcid.org/0000-0002-4747-345X

M.-F. Lin, https://orcid.org/0000-0001-8086-2484

J. Yang, https://orcid.org/0000-0002-5115-2413

X. J. Wang, https://orcid.org/0000-0003-3324-4709

T. J. A. Wolf, https://orcid.org/0000-0002-0641-1279

A. A. Cordones https://orcid.org/0000-0001-9897-5380

Document Type

Article

Date of this Version

11-1-2020

Citation

Struct. Dyn. 7, 064901 (2020); doi: 10.1063/4.0000051

Comments

Copyright 2020 Author(s). Creative Commons Attribution (CC BY) license

Abstract

Developing femtosecond resolution methods for directly observing structural dynamics is critical to understanding complex photochemical reaction mechanisms in solution. We have used two recent developments, ultrafast mega-electron-volt electron sources and vacuum compatible sub-micron thick liquid sheet jets, to enable liquid-phase ultrafast electron diffraction (LUED). We have demonstrated the viability of LUED by investigating the photodissociation of tri-iodide initiated with a 400 nm laser pulse. This has enabled the average speed of the bond expansion to be measured during the first 750 fs of dissociation and the geminate recombination to be directly captured on the picosecond time scale.