C. Bostedt
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View article: Real-time imaging of laser-driven nanoplasma expansion.
Real-time imaging of laser-driven nanoplasma expansion. Open
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges…
View article: Pulse Energy and Pulse Duration Effects in the Ionization and Fragmentation of Iodomethane by Ultraintense Hard X Rays
Pulse Energy and Pulse Duration Effects in the Ionization and Fragmentation of Iodomethane by Ultraintense Hard X Rays Open
The interaction of intense femtosecond x-ray pulses with molecules sensitively depends on the interplay between multiple photoabsorptions, Auger decay, charge rearrangement, and nuclear motion. Here, we report on a combined experimental an…
View article: X-ray absorption and soft x-ray fluorescence analysis of KDP optics
X-ray absorption and soft x-ray fluorescence analysis of KDP optics Open
Potassium Dihydrogen Phosphate (KDP) is a non-linear optical material used for laser frequency conversion and optical switches. Unfortunately, when KDP crystals are coated with a porous silica anti-reflection coating [1] and then exposed t…
View article: From synchrotrons for XFELs: the soft x-ray near-edge spectrum of the ESCA molecule
From synchrotrons for XFELs: the soft x-ray near-edge spectrum of the ESCA molecule Open
A predictive understanding of soft x-ray near-edge absorption spectra of small molecules is an enduring theoretical challenge and of current interest for x-ray probes of molecular dynamics. We report the experimental absorption spectrum fo…
View article: Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser
Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser Open
We report solids irradiated by energetic photons can be eroded in two modes, depending on the radiation intensity. High average, low-peak power sources, e.g., synchrotron radiation and high-order harmonics, induce desorption of the materia…
View article: Characterizing crystalline defects in single Xe nanoparticles from angular correlations of single-shot diffracted X-rays
Characterizing crystalline defects in single Xe nanoparticles from angular correlations of single-shot diffracted X-rays Open
Synopsis We performed a wide-angle X-ray scattering experiment of single Xe nanoparticles using an X-ray free electron laser. We developed a novel analysis method that focuses on the angular correlation between plural Bragg spots in single…
View article: Femtosecond profiling of shaped x-ray pulses
Femtosecond profiling of shaped x-ray pulses Open
Arbitrary manipulation of the temporal and spectral properties of X-ray\npulses at free-electron lasers (FELs) would revolutionize many experimental\napplications. At the Linac Coherent Light Source at Stanford National\nAccelerator Labora…
View article: Probing ultrafast ππ*/nπ* internal conversion in organic chromophores via K-edge resonant absorption
Probing ultrafast ππ*/nπ* internal conversion in organic chromophores via K-edge resonant absorption Open
Many photoinduced processes including photosynthesis and human vision happen in organic molecules and involve coupled femtosecond dynamics of nuclei and electrons. Organic molecules with heteroatoms often possess an important excited-state…
View article: Femtosecond response of polyatomic molecules to ultra-intense hard X-rays
Femtosecond response of polyatomic molecules to ultra-intense hard X-rays Open
X-ray free-electron lasers enable the investigation of the structure and dynamics of diverse systems, including atoms, molecules, nanocrystals and single bioparticles, under extreme conditions. Many imaging applications that target biologi…
View article: Atomistic three-dimensional coherent x-ray imaging of nonbiological systems
Atomistic three-dimensional coherent x-ray imaging of nonbiological systems Open
We computationally study the resolution limits for three-dimensional coherent x-ray diffractive imaging of heavy, nonbiological systems using Ar clusters as a prototype. We treat electronic and nuclear dynamics on an equal footing and remo…
View article: Measurement of high-dynamic range x-ray Thomson scattering spectra for the characterization of nano-plasmas at LCLS
Measurement of high-dynamic range x-ray Thomson scattering spectra for the characterization of nano-plasmas at LCLS Open
Atomic clusters can serve as ideal model systems for exploring ultrafast (∼100 fs) laser-driven ionization dynamics of dense matter on the nanometer scale. Resonant absorption of optical laser pulses enables heating to temperatures on the …
View article: Hetero-site-specific X-ray pump-probe spectroscopy for femtosecond intramolecular dynamics
Hetero-site-specific X-ray pump-probe spectroscopy for femtosecond intramolecular dynamics Open
New capabilities at X-ray free-electron laser facilities allow the generation of two-colour femtosecond X-ray pulses, opening the possibility of performing ultrafast studies of X-ray-induced phenomena. Particularly, the experimental realiz…
View article: Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals
Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals Open
The evolution of individual, large gas-phase xenon clusters, turned into a nanoplasma by a high power infrared laser pulse, is tracked from femtoseconds up to nanoseconds after laser excitation via coherent diffractive imaging, using ultra…
View article: Disentangling formation of multiple-core holes in aminophenol molecules exposed to bright X-FEL radiation
Disentangling formation of multiple-core holes in aminophenol molecules exposed to bright X-FEL radiation Open
Competing multi-photon ionization processes, some leading to the formation of double core hole states, have been examined in 4-aminophenol. The experiments used the linac coherent light source (LCLS) x-ray free electron laser, in combinati…
View article: Femtosecond x-ray induced fragmentation of Ho<sub>3</sub>N@C<sub>80</sub>
Femtosecond x-ray induced fragmentation of Ho<sub>3</sub>N@C<sub>80</sub> Open
We report on new data regarding on the photoionization and fragmentation dynamics of gas phase endohedral fullerenes Ho3N@C80 obtained with intense femtosecond X-ray pulses from the Linac Coherent Light Source (LCLS) free electron laser (F…
View article: A study of the dynamical energy flow in uracil
A study of the dynamical energy flow in uracil Open
The time resolved photoionization of C 1s in uracil following excitation of the neutral molecule by 260 nm pulses has been studied at LCLS.
View article: Ionization dynamics of XUV excited clusters: the role of inelastic electron collisions
Ionization dynamics of XUV excited clusters: the role of inelastic electron collisions Open
We report on the ionization and nanoplasma dynamics of small xenon clusters irradiated by intense, short pulses of a short-wavelength free-electron laser. Fluorescence spectroscopy indicates that inelastic electron collisions play a promin…
View article: Covariance mapping of two-photon double core hole states in C<sub>2</sub>H<sub>2</sub>and C<sub>2</sub>H<sub>6</sub>produced by an x-ray free electron laser
Covariance mapping of two-photon double core hole states in C<sub>2</sub>H<sub>2</sub>and C<sub>2</sub>H<sub>6</sub>produced by an x-ray free electron laser Open
Few-photon ionization and relaxation processes in acetylene (C2H2) and ethane (C2H6) were investigated at the linac coherent light source x-ray free electron laser (FEL) at SLAC, Stanford using a highly efficient multi-particle correlation…
View article: New Science Opportunities Enabled by LCLS-II X-Ray Lasers
New Science Opportunities Enabled by LCLS-II X-Ray Lasers Open
This document attempts to capture the most compelling new science opportunities that are enabled by the unique capabilities of the new LCLS-II X-ray laser facility, namely: soft and tender X-rays (0.25 to 5 keV) at high repetition rates (u…
View article: The linac coherent light source single particle imaging road map
The linac coherent light source single particle imaging road map Open
Intense femtosecond x-ray pulses from free-electron laser sources allow the imaging of individual particles in a single shot. Early experiments at the Linac Coherent Light Source (LCLS) have led to rapid progress in the field and, so far, …
View article: A two-frame movie of X-ray induced structural dynamics in single free nanoparticles
A two-frame movie of X-ray induced structural dynamics in single free nanoparticles Open
Because of their high photon flux, X-ray free-electron lasers (FEL) allow to resolve the structure of individual nanoparticles via coherent diffractive imaging (CDI) within a single X-ray pulse. Since the inevitable rapid destruction of th…