46 citations · 174 across the 21 of their papers we have counts for
25 papers
Nonlinear phenomena in X-ray fluorescence from single nanoparticles under extreme conditions
Sebastian Cardoch, Tamme Wollweber, Sarodi Jonak Dutta +26
Materials exposed to intense femtosecond X-ray pulses with energies above their K-shell absorption edge can enter an extremely ionized state, which could give rise to nonlinear phe…
Single-particle incoherent diffractive imaging and amplified spontaneous emission in copper nanocubes
Tamme Wollweber, Sarodi Jonak Dutta, Zhou Shen +26
We demonstrate element-specific incoherent diffractive imaging (IDI) of single copper nanocubes using intensity correlations of K fluorescence at a hard X-ray free-electron lase…
Single-Particle X-ray Scattering Reveals a High Local Supersaturation of Precursors as the Origin of CoO Assembly Formation
Sani Y. Harouna-Mayer, Lars Klemeyer, Cecilia A. Zito +24
Single-particle small-angle X-ray scattering (SP-SAXS) enables quantitative morphological analysis by recording diffraction snapshots from isolated particles using X-ray free-elect…
High-background X-ray single particle imaging enabled by holographic enhancement with 2D crystals
Abhishek Mall, Zhou Shen, Kartik Ayyer
X-ray single particle imaging (SPI) has offered the potential to visualize structures of biomolecules at near-atomic resolution. However, state-of-the-art structures at X-ray free…
Direct observation of the exciton polaron by serial femtosecond crystallography on single CsPbBr quantum dots
Zhou Shen, Margarita Samoli, Onur Erdem +28
The outstanding opto-electronic properties of lead halide perovskites have been related to the formation of polarons. Nevertheless, the observation of the atomistic deformation bro…
SPRING: an effective and reliable framework for image reconstruction in single-particle Coherent Diffraction Imaging
Alessandro Colombo, Mario Sauppe, Andre Al Haddad +40
Coherent Diffraction Imaging (CDI) is an experimental technique to gain images of isolated structures by recording the light scattered off the sample. In principle, the sample dens…
Observation of Aerosolization-induced Morphological Changes in Viral Capsids
Abhishek Mall, Anna Munke, Zhou Shen +27
Single-stranded RNA viruses co-assemble their capsid with the genome and variations in capsid structures can have significant functional relevance. In particular, viruses need to r…
Resolving non-equilibrium shape variations amongst millions of gold nanoparticles
Zhou Shen, Salah Awel, Anton Barty +36
Nanoparticles, exhibiting functionally relevant structural heterogeneity, are at the forefront of cutting-edge research. Now, high-throughput single-particle imaging (SPI) with x-r…
Nanoscale X-ray imaging with high spectral sensitivity using fluorescence intensity correlations
Tamme Wollweber, Kartik Ayyer
This paper introduces Spectral Incoherent Diffractive Imaging (SIDI) as a novel method for achieving dark-field imaging of nanostructures with heterogeneous oxidation states. With…
Time-resolved single-particle x-ray scattering reveals electron-density as coherent plasmonic-nanoparticle-oscillation source
D. Hoeing, R. Salzwedel, L. Worbs +18
Dynamics of optically-excited plasmonic nanoparticles are presently understood as a series of sequential scattering events, involving thermalization processes after pulsed optical…
Holographic single particle imaging for weakly scattering, heterogeneous nanoscale objects
Abhishek Mall, Kartik Ayyer
Single particle imaging (SPI) at X-ray free electron lasers (XFELs) is a technique to determine the 3D structure of nanoscale objects like biomolecules from a large number of diffr…
Ab Initio Spatial Phase Retrieval via Intensity Triple Correlations
Nolan Peard, Kartik Ayyer, Henry N. Chapman
Second-order intensity correlations from incoherent emitters can reveal the Fourier transform modulus of their spatial distribution, but retrieving the phase to enable completely g…
On the use of multilayer Laue lenses with X-ray Free Electron Lasers
Mauro Prasciolu, Kevin T. Murray, Nikolay Ivanov +34
Multilayer Laue lenses were used for the first time to focus x-rays from an X-ray Free Electron Laser (XFEL). In an experiment, which was performed at the European XFEL, we demonst…
Unsupervised learning approaches to characterize heterogeneous samples using X-ray single particle imaging
Yulong Zhuang, Salah Awel, Anton Barty +39
One of the outstanding analytical problems in X-ray single particle imaging (SPI) is the classification of structural heterogeneity, which is especially difficult given the low sig…
New aerodynamic lens injector for single particle diffractive imaging
Nils Roth, Daniel A. Horke, Jannik Lübke +17
An aerodynamic lens injector was developed specifically for the needs of single-particle diffractive imaging experiments at free-electron lasers. Its design allows for quick change…
An encryption-decryption framework for validating single-particle imaging
Zhou Shen, Colin Zhi Wei Teo, Kartik Ayyer +1
We propose an encryption-decryption framework for validating diffraction intensity volumes reconstructed using single-particle imaging (SPI) with x-ray free-electron lasers (XFELs)…
3D diffractive imaging of nanoparticle ensembles using an X-ray laser
Kartik Ayyer, P. Lourdu Xavier, Johan Bielecki +34
We report the 3D structure determination of gold nanoparticles (AuNPs) by X-ray single particle imaging (SPI). Around 10 million diffraction patterns from gold nanoparticles were m…
Photon statistics and signal to noise ratio for incoherent diffraction imaging
Fabian Trost, Kartik Ayyer, Henry Chapman
Intensity interferometry is a well known method in astronomy. Recently, a related method called incoherent diffractive imaging (IDI) was proposed to apply intensity correlations of…
Reference-enhanced X-ray Single Particle Imaging
Kartik Ayyer
X-ray single particle imaging involves the measurement of a large number of noisy diffraction patterns of isolated objects in random orientations. The missing information about the…
Megahertz single-particle imaging at the European XFEL
Egor Sobolev, Serguey Zolotarev, Klaus Giewekemeyer +60
The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimenta…
Low-signal limit of X-ray single particle imaging
Kartik Ayyer, Andrew J. Morgan, Andrew A. Aquila +7
An outstanding question in X-ray single particle imaging experiments has been the feasibility of imaging sub 10-nm-sized biomolecules under realistic experimental conditions where…
Incoherent Diffractive Imaging via Intensity Correlations of hard X-rays
Anton Classen, Kartik Ayyer, Henry N. Chapman +2
Established x-ray diffraction methods allow for high-resolution structure determination of crystals, crystallized protein structures or even single molecules. While these technique…
Continuous Diffraction of Molecules and Disordered Molecular Crystals
Henry N. Chapman, Oleksandr M. Yefanov, Kartik Ayyer +6
The diffraction pattern of a single non-periodic compact object, such as a molecule, is continuous and is proportional to the square modulus of the Fourier transform of that object…
Real-Space x-ray tomographic reconstruction of randomly oriented objects with sparse data frames
Kartik Ayyer, Hugh T. Philipp, Mark W. Tate +2
Schemes for X-ray imaging single protein molecules using new x-ray sources, like x-ray free electron lasers (XFELs), require processing many frames of data that are obtained by tak…