FS-CXS

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2018-10-19
09:17
OpenAccess [PUBDB-2018-03848] Book/Report/Dissertation / PhD Thesis
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Structure of complex fluids under shear flows
[DESY-THESIS-2018-028]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 137 pp. () [10.3204/PUBDB-2018-03848] = Dissertation, Universität Hamburg, 2018  GO
With the recent developments of modern synchrotron and X-ray Free Electron Laser (XFEL) light sources high speed and micrometer sized liquid jets have become one of the most important sample delivery systems. For that reason it is highly important to develop liquid jet devices compatible with micrometer X-ray beams, which are optimized for the investigation of nanostructures and the behavior of complex liquids behavior under flow.This thesis reports a detailed X-ray scattering study of a liquid jet produced by a gas dynamic virtual nozzle (GDVN) system. [...]
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2018-10-17
10:44
[PUBDB-2018-03818] Poster
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Ultrafast Demagnetization by Extreme Ultraviolet Light
German Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities, SNI, MünchenMünchen, Germany, 17 Sep 2018 - 19 Sep 20182018-09-172018-09-19
Free-electron lasers (FELs) enable the study of dynamics in matter on combined femtosecond time and nanometer length scales [1]. One of the most intriguing topics within contemporary research on magnetism, ultrafast near-infrared (IR) laser-induced demagnetization [2,3], has greatly benefited from the advent of FELs [4] as it was shown that optically generated superdiffusive spin currents [5] contribute to that phenomenon [6]. [...]

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2018-09-26
13:15
OpenAccess [PUBDB-2018-03613] Journal Article
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Dynamics of soft nanoparticle suspensions at hard X-ray FEL sources below the radiation damage threshold
IUCrJ 5(6), 801 - 807 () [10.1107/S2052252518013696]  GO
The application of X-ray photon correlation spectroscopy (XPCS) at free-electron laser (FEL) facilities enables, for the first time, the study of dynamics on a (sub-)nanometre scale in an unreached time range between femtoseconds and seconds. For soft-matter materials, radiation damage is a major limitation when going beyond single-shot applications [...]
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2018-09-07
15:47
Embargoed OpenAccess [PUBDB-2018-03414] Journal Article
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X-ray spectroscopy with variable line spacing based on reflection zone plate optics
Optics letters 43(18), 4390 - 4393 () [10.1364/OL.43.004390]  GO
X-ray spectroscopy is a method, ideally suited for investigating the electronic structure of matter, which has been enabled by the rapid developments in light sources and instruments. The x-ray fluorescence lines of life-relevant elements such as carbon, nitrogen, and oxygen are located in the soft x-ray regime and call for suitable spectrometer devices. [...]
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2018-08-04
07:01
Embargoed OpenAccess [PUBDB-2018-02744] Journal Article
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Pressure-Stimulated Supercrystals Formation in Nanoparticle Suspensions
Nanoparticles can self-organize into “supercrystals” with many potential applications. Different paths can lead to nanoparticle self-organization into such periodic arrangements. [...]
Published on 2018-08-02. Available in OpenAccess from 2019-08-02.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
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2018-05-15
11:13
OpenAccess [PUBDB-2018-01959] Journal Article
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Coherent X-rays reveal the influence of cage effects on ultrafast water dynamics
The dynamics of liquid water feature a variety of time scales, ranging from extremely fast ballistic-like thermal motion, to slower molecular diffusion and hydrogen-bond rearrangements. Here, we utilize coherent X-ray pulses to investigate the sub-100 fs equilibrium dynamics of water from ambient conditions down to supercooled temperatures [...]
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2018-04-17
14:45
OpenAccess [PUBDB-2018-01732] Journal Article
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Towards ultrafast dynamics with split-pulse X-ray photon correlation spectroscopy at free electron laser sources
One of the important challenges in condensed matter science is to understand ultrafast, atomic-scale fluctuations that dictate dynamic processes in equilibrium and non-equilibrium materials. Here, we report an important step towards reaching that goal by using a state-of-the-art perfect crystal based split-and-delay system, capable of splitting individual X-ray pulses andintroducing femtosecond to nanosecond time delays. [...]
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2018-04-06
11:32
OpenAccess [PUBDB-2018-01633] Journal Article
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Heterogeneous local order in self-assembled nanoparticle films revealed by X-ray Cross Corelation
IUCrJ 5(3), 354 - 360 () [10.1107/S2052252518005407]  GO
We report on the self-assembly of gold nanoparticles coated with a soft poly(ethylene glycol) shell studied by X-ray cross-correlation analysis. Depending on the initial concentration of gold nanoparticles used, structurally heterogeneous films were formed [...]
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2018-03-08
11:38
OpenAccess [PUBDB-2018-01437] Journal Article
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Note: Soft X-ray transmission polarizer based on ferromagnetic thin films
A transmission polarizer for producing elliptically polarized soft X-ray radiation from linearly polarized light is presented. The setup is intended for use at synchrotron and free-electron laser beamlines that do not directly offer circularly polarized light for, e.g., X-ray magnetic circular dichroism (XMCD) measurements or holographic imaging. [...]
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2018-01-10
14:05
[PUBDB-2018-00361] Journal Article
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A new class of copolymer colloids with tunable, low refractive index for investigations of structure and dynamics in concentrated suspensions
Highly charged polymer colloids may serve as model systems for the investigation of condensed matter, if they self-organize to liquid-like, glassy or crystalline phases. Multiple scattering due to refractive index differences of colloidal particles and suspending medium is a serious problem when utilizing light scattering experiments for these investigations. [...]
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