Themed collection Time resolved imaging of photo-induced dynamics
List of participants
Adam Kirrander and Gopal Dixit introduce the Faraday Discussion volume on Time-resolved imaging of photo-induced dynamics.
Concluding remarks: The age of molecular movies
Chiral current generated by coherent electronic excitation of a chiralmolecule. Image courtesy of A. Ordonez, D. Ayuso and O. Smirnova.
Spiers Memorial Lecture: Introduction to ultrafast spectroscopy and imaging of photochemical reactions
A brief overview is presented on ultrafast spectroscopy and imaging of photochemical reactions by highlighting several experimental studies reported in the last five years.
Femtosecond X-ray spectroscopy of haem proteins
We discuss our recently reported femtosecond (fs) X-ray emission spectroscopy results on the ligand dissociation and recombination in nitrosylmyoglobin (MbNO) in the context of previous studies on ferrous haem proteins.
Ultraintense, ultrashort pulse X-ray scattering in small molecules
We examine X-ray scattering from an isolated organic molecule from the linear to nonlinear absorptive regime.
Towards novel probes for valence charges via X-ray optical wave mixing
We present a combined theoretical and experimental study of X-ray optical wave mixing.
Strong-field ionization of polyatomic molecules: ultrafast H atom migration and bond formation in the photodissociation of CH3OH
Quantum control of intramolecular H migration and Hn+ (n = 1–3) ions formation from ionized CH3OH using laser parameters has been experimentally demonstrated, while the mechanism of H migration and dissociation of CH3OH+ have been explained successfully.
Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules: a candidate system for time-resolved dynamics
We focus on detailed investigations of the molecular acetylene-vinylidene system in the photon energy range 19–40 eV where extreme-ultraviolet pulses can probe the dynamics effectively.
Mapping static core-holes and ring-currents with X-ray scattering
Quantum chemistry simulations in conjunction with scattering theory are used to demonstrate how static core-holes and attosecond valence electron currents manifest as measurable X-ray scattering modulations.
A quantum molecular movie: polyad predissociation dynamics in the VUV excited 3pσ2Σu state of NO2
We present time-resolved photoelectron spectroscopy studies of an electronically excited triatomic molecule wherein the vibrational dynamics must be treated quantum mechanically and the simple picture of population flow between coupled normal modes fails.
Electronic relaxation of aqueous aminoazobenzenes studied by time-resolved photoelectron spectroscopy and surface hopping TDDFT dynamics calculations
We use time-resolved photoelectron spectroscopy in solution to follow relaxation of two prototypical aqueous chromophores, Methyl Orange and Metanil Yellow.
Resolving multiphoton processes with high-order anisotropy ultrafast X-ray scattering
Resolving multiphoton processes in strongly excited iodine de novo using high-order anisotropy components in ultrafast X-ray scattering.
Coupled nuclear–electronic decay dynamics of O2 inner valence excited states revealed by attosecond XUV wave-mixing spectroscopy
Attosecond XUV wave-mixing spectroscopy probes the few-fs decay dynamics of the short-lived 3sσg Rydberg state of O2.
Perspectives for analyzing non-linear photo-ionization spectra with deep neural networks trained with synthetic Hamilton matrices
We have constructed deep neural networks, which can map fluctuating photo-electron spectra obtained from noisy pulses to spectra from noise-free pulses.
Strong-field induced fragmentation and isomerization of toluene probed by ultrafast femtosecond electron diffraction and mass spectrometry
We investigate the fragmentation and isomerization of toluene molecules induced by strong-field ionization with a femtosecond near-infrared laser pulse.
Time-resolved pump–probe spectroscopy with spectral domain ghost imaging
We show that spectral ghost imaging can be applied to time-resolved pump–probe measurements.
Time-resolved imaging of correlation-driven charge migration in light-induced molecular magnets by X-ray scattering
Time-resolved current densities and X-ray scattering simulations yield information about the charge migration mechanism in laser-driven molecular magnets.
Quantum electronic coherences by attosecond transient absorption spectroscopy: ab initio B-spline RCS-ADC study
RCS-ADC simulated X-ray attosecond transient absorption observables unveil and retrieve the quantum electronic coherences upon attosecond molecular photoionisation.
Molecular fragmentation as a way to reveal early electron dynamics induced by attosecond pulses
We present a theoretical study of the electron and nuclear dynamics that would arise in an attosecond two-color XUV-pump/XUV-probe experiment in glycine.
Multi-channel photodissociation and XUV-induced charge transfer dynamics in strong-field-ionized methyl iodide studied with time-resolved recoil-frame covariance imaging
The photodissociation dynamics of strong-field ionized methyl iodide were probed using intense extreme ultraviolet (XUV) radiation produced by the SPring-8 Angstrom Compact free electron LAser.
Transient resonant Auger–Meitner spectra of photoexcited thymine
We present the first investigation of excited state dynamics by resonant Auger–Meitner spectroscopy (also known as resonant Auger spectroscopy) using the nucleobase thymine as an example.
Determination of excited state molecular structures from time-resolved gas-phase X-ray scattering
We present a comprehensive investigation of a recently introduced method to determine transient structures of molecules in excited electronic states with sub-ångstrom resolution from time-resolved gas-phase scattering signals.
Attosecond laser control of photoelectron angular distributions in XUV-induced ionization of H2
An attosecond XUV pump-IR probe scheme is used to exert control on H2 ionization dynamics and induce preferential electron ejection directions.
XUV pump–XUV probe transient absorption spectroscopy at FELs
A setup for an all-XUV transient absorption spectroscopy at free-electron lasers, was developed and employed to explore XUV-excited dynamics and XUV-driven nonlinear phenomena.
Effect of dynamic correlation on the ultrafast relaxation of uracil in the gas phase
High level multi-reference non-adiabatic dynamics simulations reveal that uracil’s photoexcited S2 state decays very quickly without any significant trapping.
Time-resolving the UV-initiated photodissociation dynamics of OCS
We time-resolved the UV-induced photodissociation of OCS at λ = 237 nm through pump-probe ion imaging.
Manipulating twisted electrons in strong-field ionization
We investigate the orbital angular momentum (OAM) of photoelectrons freed in strong-field ionization. We use this to provide an explanation for interference vortices and discuss utilizing the OAM in time-resolved imaging of photo-induced dynamics.
Time-resolved diffraction: general discussion
Time-resolved ultrafast spectroscopy: general discussion
Ultrafast X-ray science: general discussion
Strong-field physics: general discussion
About this collection
We are delighted to share with you a selection of the papers associated with a Faraday Discussion on Time resolved imaging of photo-induced dynamics. More information about the related event may be found here: http://rsc.li/dynamics-fd2021. Additional articles will be added to the collection as they are published. The final versions of all the articles presented and a record of the virtual discussions will be published after the event.
Photo-induced processes are of tremendous importance in the natural world and across science. Examples include ultrafast process in vision, energy-release by water-splitting in photosynthesis, chemical reactions in the atmosphere, photocatalysis, and technologies such as petahertz electronics, photovoltaics, and light-emitting diodes. Due to the intrinsic complexity of photo-induced processes, they remain the least understood type of physical and chemical processes. Strong and weak laser induced electron and nuclear dynamics on ultrafast time-scales, nonadiabatic dynamics, quantum effects and conical intersections are known to be important, but the full picture is still being unveiled and a cohesive understanding assembled. New experimental techniques, capable of monitoring photo-induced processes with unprecedented temporal and spatial resolution across the entire reaction path, play a key role in this.