FS-CFEL-1

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2017-05-25
10:24
OpenAccess [PUBDB-2017-03645] Journal Article
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Coherent acoustic perturbation of second-harmonic generation in NiO
ddc:530
We investigate the structural and magnetic origins of the unusual ultrafast second-harmonic-generation (SHG) response of femtosecond-laser-excited nickel oxide (NiO) previously attributed to oscillatory reorientation dynamics of the magnetic structure induced by $d−d$ excitations. Using time resolved x-ray diffraction from the $(\frac{3}{2}\frac{3}{2}\frac{3}{2})$magnetic planes, we show that changes in the magnitude of the magnetic structure factor following ultrafast optical excitation are limited to $\Delta⟨F_{m}⟩/⟨F_{m}⟩ =$ 1.5% in the first 30 ps [...]
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2017-05-22
14:41
OpenAccess [PUBDB-2017-03368] Journal Article
; ; ; et al
Probing Dynamics in Colloidal crystals with pump-probe experiments at LCLS Methodololgy and analysis
Seminar, Meeting locationHamburg, Germany,
Applied Sciences 7(5), 519 (2017) [10.3390/app7050519]  GO
ddc:600
We present results of the studies of dynamics in colloidal crystals performed by pump-probeexperiments using an X-ray free-electron laser (XFEL). Colloidal crystals were pumped with aninfrared laser at a wavelength of 800 nm with varying power and probed by XFEL pulses at anenergy of 8 keV with a time delay up to 1000 ps. [...]
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2017-05-10
10:10
OpenAccess [PUBDB-2017-02555] Journal Article
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Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera
ddc:540
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...]
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2017-05-02
09:51
[PUBDB-2017-02127] Dissertation / PhD Thesis

Imaging structure and dynamics using controlled molecules
147 p. (2017) = Universität Hamburg, Diss., 2016

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2017-05-02
09:45
[PUBDB-2017-02125] Master Thesis

Laser Sheet Imaging of Dynamically Focused Ammonia Molecules
45 p. (2016) = Universität Hamburg, Masterarbeit, 2016

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2017-05-02
09:34
[PUBDB-2017-02124] Dissertation / PhD Thesis

Orientation of state selected OCS molecules in mixed strong dc and laser fields
109 p. (2016) = Universität Hamburg, Diss., 2016

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2017-04-28
13:21
OpenAccess [PUBDB-2017-02112] Bachelor Thesis
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Charakterisierung von Aerosolstrahlen mittels Laserionisationsmassenspektrometrie
49 p. (2016) [10.3204/PUBDB-2017-02112] = Universität Hamburg, Bachelorarbeit, 2016  GO
Eines der interessantesten heutigen Projekte in der Biochemie und der Molekülphysik ist die Beobachtung von biologischen oder chemischen Reaktionen in Molekülen mit atomarer räumlicher Präzision. Eine vielversprechende Methode hierfür basiert auf dem Einsatz einer aerodynamischen Linse zur Fokussierung der Teilchen und der Untersuchung dieser Moleküle mit FreieElektronen-Lasern, um die Struktur der Moleküle, also die Positionen der Elektronen und Atomkerne, festzustellen. [...]
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2017-04-12
10:21
OpenAccess [PUBDB-2017-01661] Journal Article
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Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser
ddc:530
In pump-probe experiments employing a free-electron laser (FEL) in combination with a synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the optical laser pulse often severely limits the temporal resolution that can be achieved. Here, we present a pump-probe experiment on the UV-induced dissociation of 2,6-difluoroiodobenzene $(C_{6}H_{3}F_{2}I)$ molecules performed at the FLASH FEL that takes advantage of recent upgrades of the FLASH timing and synchronization system to obtain high-quality data that are not limited by the FEL arrival-time jitter. [...]
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2017-03-27
10:17
OpenAccess [PUBDB-2017-01464] Journal Article
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Simulating electric field interactions with polar molecules using spectroscopic databases
ddc:000
Ro-vibrational Stark-associated phenomena of small polyatomic molecules are modelled using extensive spectroscopic data generated as part of the ExoMol project. The external field Hamiltonian is built from the computed ro-vibrational line list of the molecule in question. [...]
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2017-03-18
19:12
[PUBDB-2017-01411] Journal Article

Single molecule imaging using X-ray free electron lasers
ddc:570
The potential to image single molecules in action without the need for crystallisation was one of the most exciting applications promised during construction of the first XFELs. Over the past years significant progress has been made, even though the goal of molecular imaging has not yet been achieved. [...]
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