CFEL-DESYT

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2017-09-22
11:13
[PUBDB-2017-10986] Journal Article
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2D THz-THz-Raman Photon-Echo Spectroscopy of Molecular Vibrations in Liquid Bromoform
ddc:530
Fundamental properties of molecular liquids are governed by long-range interactions that most prominently manifest at terahertz (THz) frequencies. Here we report the detection of nonlinear THz photon-echo (rephasing) signals in liquid bromoform using THz-THz-Raman spectroscopy. [...]
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2017-09-19
13:46
[PUBDB-2017-10894] Journal Article
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Picosecond relaxation of X-ray excited GaAs
ddc:530
In this paper we present the current status of our theoretical studies on ultrafast relaxation of X-ray/XUV excited gallium arsenide. First, we discuss our previous approach, the unified model based on rate equations, two-temperature model and the extended Drude approach [...]
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2017-09-13
09:50
[PUBDB-2017-10687] Journal Article
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Simulations of ultrafast x–ray laser experiments
SPIE Optics + Optoelectronics, Meeting locationPrague, Czech Republic,

Proceedings of SPIE 10237, 102370S (2017) [10.1117/12.2270552]  GO
ddc:620
Simulations of experiments at modern light sources, such as optical laser laboratories, synchrotrons, and free electron lasers, become increasingly important for the successful preparation, execution, and analysis of these experiments investigating ever more complex physical systems, e.g. biomolecules, complex materials, and ultra–short lived states of matter at extreme conditions [...]
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2017-09-07
12:59
OpenAccess [PUBDB-2017-10472] Journal Article
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Ultrafast isomerization in acetylene dication after carbon K-shell ionization
ddc:500
Ultrafast proton migration and isomerization are key processes for acetylene and its ions. However, the mechanism for ultrafast isomerization of acetylene [HCCH]$^{2+}$to vinylidene [H$_2$CC]$^{2+}$ dication remains nebulous [...]
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2017-09-05
12:28
OpenAccess [PUBDB-2017-10340] Journal Article
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Start-to-end simulation of single-particle imaging using ultra-short pulses at the European X-ray Free-Electron Laser

IUCrJ 4(5), 560 - 568 (2017) [10.1107/S2052252517009496]  GO
ddc:530
Single-particle imaging with X-ray free-electron lasers (XFELs) has the potential to provide structural information at atomic resolution for non-crystalline biomolecules. This potential exists because ultra-short intense pulses can produce interpretable diffraction data notwithstanding radiation damage [...]
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2017-09-04
11:09
[PUBDB-2017-10290] Journal Article
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Simulations of single-particle imaging of hydrated proteins with x-ray free-electron lasers
Advances in Computational Methods for X-Ray Optics IV, Meeting locationSan Diego, United States, 6 Aug 2017 - 10 Aug 20172017-08-062017-08-10

Proceedings of SPIE 10388, 10388OM (2017) [10.1117/12.2275274]  GO
ddc:620
We employ start–to-end simulations to model coherent diffractive imaging of single biomolecules usingx-ray free electron lasers. This technique is expected to yield new structural information about biologically relevantmacromolecules thanks to the ability to study the isolated sample in its natural environment as opposed to crystallizedor cryogenic samples. [...]
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2017-08-28
13:32
OpenAccess [PUBDB-2017-09980] Journal Article
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Molecular-dynamics approach for studying the nonequilibrium behavior of x-ray-heated solid-density matter
ddc:530
When matter is exposed to a high-intensity x-ray free-electron-laser pulse, the x rays excite inner-shell electrons leading to the ionization of the electrons through various atomic processes and creating high-energy-density plasma, i.e., warm or hot dense matter. The resulting system consists of atoms in various electronic configurations, thermalizing on subpicosecond to picosecond timescales after photoexcitation [...]
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2017-07-31
11:48
[PUBDB-2017-08762] Journal Article
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Cationic and Anionic Impact on the Electronic Structure of Liquid Water
ddc:530
Hydration shells around ions are crucial for many fundamental biological and chemical processes. Their local physicochemical properties are quite different from those of bulk water and hard to probe experimentally. [...]
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2017-07-28
13:11
[PUBDB-2017-08695] Journal Article
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Weak-field few-femtosecond VUV photodissociation dynamics of water isotopologues
ddc:530
We present a joint experimental and theoretical study of the VUV-induced dynamics of $H_2O$ and its deuterated isotopologues in the first excited state $(A^1B_1)$ utilizing a VUV-pump VUV-probe scheme combined with $ab$ initio classical trajectory calculations. 16-fs VUV pulses centered at 161 nm created by fifth-order harmonic generation are employed for single-shot pump-probe measurements. [...]
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2017-06-30
17:57
OpenAccess [PUBDB-2017-06524] Journal Article
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Pulse Duration of Seeded Free-Electron Lasers
ddc:530
The pulse duration, and, more generally, the temporal intensity profile of free-electron laser (FEL) pulses, is of utmost importance for exploring the new perspectives offered by FELs; it is a nontrivial experimental parameter that needs to be characterized. We measured the pulse shape of an extremeultraviolet externally seeded FEL operating in high-gain harmonic generation mode. [...]
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