Ultrafast x-ray scattering of photodissociation dynamics in 2-iodothiophene
Abstract
A time-resolved x-ray scattering (TRXS) investigation of the photodissociation dynamics of gas-phase 2-iodothiophene molecules following 252 nm excitation is presented. Structural evolution of the molecule and dynamical information on the resulting photofragments were captured using femtosecond x-ray free-electron laser pulses. Two dissociation pathways were identified, arising via excitation to ππ* and (n/π)σ* states, respectively, yielding distinct interfragment recoil velocities of ∼6.4 Åps−1 and 17.0 Åps−1. A comparison of asymptotic scattering data with simulated patterns indicates that the thiophene ring remains closed following dissociation at this wavelength. Modeling the experimental data yields a branching ratio of ∼3:1 in favor of the high velocity channel. These findings demonstrate the capability of TRXS to disentangle concurrent ultrafast reaction pathways and provide detailed structural insight into energy redistribution during photoinduced bond fission in complex molecular systems.
Article Details
Journal Info
The Journal of Chemical Physics
American Institute of Physics
Authors (29)
Weronika O. Razmus
Ian Gabalski
Felix Allum
Stanford PULSE Institute
Grite L. Abma
Institute for Molecules and Materials, Radboud University 4 , Heijendaalseweg 135, 6525 AJ Nijmegen,
Mathew Britton
Sébastien Boutet
Philip H. Bucksbaum
Xinxin Cheng
Stuart W. Crane
Department of Chemistry, Brown University 6 , Providence, Rhode Island 02912,
Gregory Gate
Linac Coherent Light Source, SLAC National Accelerator Laboratory 5 , 2575 Sand Hill Road, Menlo Park, California 94025,
Aaron Ghrist
PULSE Institute, SLAC National Accelerator Laboratory 2 , 2575 Sand Hill Road, Menlo Park, California 94025,
Martin Graßl
PULSE Institute, SLAC National Accelerator Laboratory 2 , 2575 Sand Hill Road, Menlo Park, California 94025,
Alice E. Green
EaStCHEM School of Chemistry
Nathan Goff
Department of Chemistry, Brown University 6 , Providence, Rhode Island 02912,
Daniel A. Horke
Institute for Molecules and Materials, Radboud University 4 , Heijendaalseweg 135, 6525 AJ Nijmegen,
Lisa Huang
Department of Chemistry, Brown University 6 , Providence, Rhode Island 02912,
Mengning Liang
Linac Coherent Light Source, SLAC National Accelerator Laboratory 5 , 2575 Sand Hill Road, Menlo Park, California 94025,
Yusong Liu
Lingyu Ma
Michael P. Minitti
Linac Coherent Light Source, SLAC National Accelerator Laboratory 5 , 2575 Sand Hill Road, Menlo Park, California 94025,
Thomas Northey
Department of Chemistry, Brown University 6 , Providence, Rhode Island 02912,
Asami Odate
Department of Chemistry, Brown University 6 , Providence, Rhode Island 02912,
Joseph Robinson
Linac Coherent Light Source, SLAC National Accelerator Laboratory 5 , 2575 Sand Hill Road, Menlo Park, California 94025,
Peter M. Weber
Department of Chemistry
Thomas Wolf
Linac Coherent Light Source, SLAC National Accelerator Laboratory 5 , 2575 Sand Hill Road, Menlo Park, California 94025,
Basile F. E. Curchod
School of Chemistry, Cantock’s Close
Michael N. R. Ashfold
School of Chemistry, Cantock’s Close
Russell S. Minns
School of Chemistry and Chemical Engineering
Ruaridh Forbes
Linac Coherent Light Source