275 citations · 1.3k across the 23 of their papers we have counts for
23 papers
Imaging the Photochemistry of Cyclobutanone using Ultrafast Electron Diffraction: Experimental Results
A. E. Green, Y. Liu, F. Allum +27
We investigated the ultrafast structural dynamics of cyclobutanone following photoexcitation at nm using gas-phase megaelectronvolt ultrafast electron diffraction. Our inve…
Calculation of RF-induced Temporal Jitter in Ultrafast Electron Diffraction
Tianzhe Xu, Fuhao Ji, Stephen Weathersby +1
A significant contribution to the temporal resolution of an ultrafast electron diffraction (UED) instrument is arrival time jitter caused by amplitude and phase variation of radio…
Monitoring the evolution of relative product populations at early times during a photochemical reaction
Joao Pedro Figueira Nunes, Lea Maria Ibele, Shashank Pathak +31
Identifying multiple rival reaction products and transient species formed during ultrafast photochemical reactions and determining their time-evolving relative populations are key…
Investigating dissociation pathways of nitrobenzene via mega-electron-volt ultrafast electron diffraction
Kareem Hegazy, James Cryan, Renkai Li +8
As the simplest nitroaromatic compound, nitrobenzene is an interesting model system to explore the rich photochemistry of nitroaromatic compounds. Previous measurements of nitroben…
Applying Bayesian Inference and deterministic anisotropy to retrieve the molecular structure distribution from gas-phase diffraction experiments
Kareem Hegazy, Varun Makhija, Phil Bucksbaum +12
Currently, our general approach to retrieving molecular structures from ultrafast gas-phase diffraction heavily relies on complex ab initio electronic or vibrational excited state…
Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites
Nuri Yazdani, Maryna I. Bodnarchuk, Federica Bertolotti +20
Understanding the origin of electron-phonon coupling in lead-halide perovskites (LHP) is key to interpreting and leveraging their optical and electronic properties. Here we perform…
Role of equilibrium fluctuations in light-induced order
Alfred Zong, Pavel E. Dolgirev, Anshul Kogar +17
Engineering novel states of matter with light is at the forefront of materials research. An intensely studied direction is to realize broken-symmetry phases that are "hidden" under…
Visualizing femtosecond dynamics with ultrafast electron probes through terahertz compression and time-stamping
Mohamed A. K. Othman, Emma C. Snively, Annika E. Gabriel +9
Visualizing ultrafast dynamics at the atomic scale requires time-resolved pump-probe characterization with femtosecond temporal resolution. For single-shot ultrafast electron diffr…
Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals
Burak Guzelturk, Benjamin L. Cotts, Dipti Jasrasaria +26
Nonradiative processes limit optoelectronic functionality of nanocrystals and curb their device performance. Nevertheless, the dynamic structural origins of nonradiative relaxation…
Experimental demonstration of particle acceleration with normal conducting accelerating structure at cryogenic temperature
Mamdouh Nasr, Emilio Nanni, Martin Breidenbach +3
Reducing the operating temperature of normal conducting particle accelerators substantially increases their efficiency. Low-temperature operation increases the yield strength of th…
Ultrafast formation of transient 2D diamond-like structure in twisted bilayer graphene
Duan Luo, Dandan Hui, Bin Wen +17
Due to the absence of matching carbon atoms at honeycomb centers with carbon atoms in adjacent graphene sheets, theorists predicted that a sliding process is needed to form AA, AB,…
Effect of lattice excitations on transient near edge X-ray absorption spectroscopy
N. Rothenbach, M. E. Gruner, K. Ollefs +17
Time-dependent and constituent-specific spectral changes in soft near edge X-ray spectroscopy (XAS) of an [Fe/MgO] metal/insulator heterostructure upon laser excitation are ana…
SLAC UED LLRF System Upgrade
L. Ma, X. Shen, K. Kim +11
The SLAC mega-electron-volt (MeV) ultrafast electron diffraction (UED) instrument is a powerful "electron camera" for the study of time-resolved, ultrafast atomic & molecular dynam…
Femtosecond compression dynamics and timing jitter suppression in a terahertz-driven electron bunch compressor
E. C. Snively, M. A. K. Othman, M. Kozina +8
We present the first demonstration of THz-driven bunch compression and timing stabilization of a few-fC relativistic electron beam with kinetic energy of 2.5 MeV using quasi-single…
Nanopatterned electron beams for temporal coherence and deterministic phase control of x-ray free-electron lasers
W. S. Graves, S. L. Y. Chang, D. Dwyer +11
We demonstrate the ability to create electron beams with high-contrast, nanometer-scale density modulations as a first step toward developing full control of the phase fronts of an…
Theoretical and experimental electron diffraction intensity maps for single crystal silicon from an ultrafast source
L. E. Malin, W. S. Graves, M. Holl +5
Electron diffraction through a thin patterned silicon membrane can be used to create complex spatial modulations in electron distributions by varying the intensity of different ref…
Light-Induced Charge Density Wave in LaTe
Anshul Kogar, Alfred Zong, Pavel E. Dolgirev +18
When electrons in a solid are excited with light, they can alter the free energy landscape and access phases of matter that are beyond reach in thermal equilibrium. This accessibil…
Microscopic non-equilibrium energy transfer dynamics in a photoexcited metal/insulator heterostructure
N. Rothenbach, M. E. Gruner, K. Ollefs +15
The element specificity of soft X-ray spectroscopy makes it an ideal tool for analyzing the microscopic origin of ultrafast dynamics induced by localized optical excitation in meta…
Ultrafast manipulation of mirror domain walls in a charge density wave
Alfred Zong, Xiaozhe Shen, Anshul Kogar +11
Domain walls (DWs) are singularities in an ordered medium that often host exotic phenomena such as charge ordering, insulator-metal transition, or superconductivity. The ability to…
Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction
T. J. A. Wolf, D. M. Sanchez, J. Yang +20
The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactio…
Terahertz-based attosecond metrology of relativistic electron beams
R. K. Li, M. C. Hoffmann, E. A. Nanni +9
Photons, electrons, and their interplay are at the heart of photonic devices and modern instruments for ultrafast science [1-10]. Nowadays, electron beams of the highest intensity…
Diffractive Imaging of Coherent Nuclear Motion in Isolated Molecules
Jie Yang, Markus Guehr, Xiaozhe Shen +17
Observing the motion of the nuclear wavepackets during a molecular reaction, in both space and time, is crucial for understanding and controlling the outcome of photoinduced chemic…
Diffractive imaging of a molecular rotational wavepacket with femtosecond Megaelectronvolt electron pulses
Jie Yang, Markus Guehr, Theodore Vecchione +20
Imaging changes in molecular geometries on their natural femtosecond timescale with sub-Angstrom spatial precision is one of the critical challenges in the chemical sciences, since…