scholarly journals Demonstration of a picosecond Bragg switch for hard X-rays in a synchrotron-based pump–probe experiment

2019 ◽  
Vol 26 (4) ◽  
pp. 1253-1259 ◽  
Author(s):  
Mathias Sander ◽  
Roman Bauer ◽  
Victoria Kabanova ◽  
Matteo Levantino ◽  
Michael Wulff ◽  
...  
Keyword(s):  
Epitaxial Films ◽  
High Repetition Rate ◽  
X Rays ◽  
Sound Waves ◽  
Optical Pump ◽  
Pump Probe ◽  
X Ray ◽  
Benchmark Experiment ◽  
Probe Experiment ◽  
Pump Probe Experiment

A benchmark experiment is reported that demonstrates the shortening of hard X-ray pulses in a synchrotron-based optical pump–X-ray probe measurement. The pulse-shortening device is a photoacoustic Bragg switch that reduces the temporal resolution of an incident X-ray pulse to approximately 7.5 ps. The Bragg switch is employed to monitor propagating sound waves in nanometer thin epitaxial films. From the experimental data, the pulse duration, diffraction efficiency and switching contrast of the device can be inferred. A detailed efficiency analysis shows that the switch can deliver up to 109 photons s−1 in high-repetition-rate synchrotron experiments.

Asynchronous sampling for ultrafast experiments with low momentum compaction at the ANKA ring

2011 ◽  
Vol 18 (4) ◽  
pp. 539-545 ◽  
Author(s):  
Shyjumon Ibrahimkutty ◽  
Daniel Issenmann ◽  
Stefan Schleef ◽  
Anke-Susanne Müller ◽  
Yves-Laurent Mathis ◽  
...  
Keyword(s):  
High Repetition Rate ◽  
Pump Probe ◽  
X Ray ◽  
Asynchronous Sampling ◽  
High Repetition ◽  
Phonon Dynamics ◽  
Probe Experiment ◽  
The Time Domain ◽  
Pump Probe Experiment ◽  
Better Than

A high-repetition-rate pump–probe experiment is presented, based on the asynchronous sampling approach. The low-α mode at the synchrotron ANKA can be used for a time resolution down to the picosecond limit for the time-domain sampling of the coherent THz emission as well as for hard X-ray pump–probe experiments, which probe structural dynamics in the condensed phase. It is shown that a synchronization of better than 1 ps is achieved, and examples of phonon dynamics of semiconductors are presented.

scholarly journals Serial X-ray Crystallography

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 99
Author(s):  
Ki Hyun Nam
Keyword(s):  
Room Temperature ◽  
X Rays ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
X Ray Crystallography ◽  
Target Molecules ◽  
Serial Crystallography ◽  
Pump Probe Experiment ◽  
Serial Femtosecond Crystallography

Serial crystallography (SX) is an emerging technique to determine macromolecules at room temperature. SX with a pump–probe experiment provides the time-resolved dynamics of target molecules. SX has developed rapidly over the past decade as a technique that not only provides room-temperature structures with biomolecules, but also has the ability to time-resolve their molecular dynamics. The serial femtosecond crystallography (SFX) technique using an X-ray free electron laser (XFEL) has now been extended to serial synchrotron crystallography (SSX) using synchrotron X-rays. The development of a variety of sample delivery techniques and data processing programs is currently accelerating SX research, thereby increasing the research scope. In this editorial, I briefly review some of the experimental techniques that have contributed to advances in the field of SX research and recent major research achievements. This Special Issue will contribute to the field of SX research.

Imaging of ultrafast electron motion in molecules

2011 ◽  
Vol 89 (6) ◽  
pp. 703-707 ◽  
Author(s):  
Samira Barmaki ◽  
Karima Guessaf ◽  
Stéphane Laulan
Keyword(s):  
Time Dependent ◽  
Second Step ◽  
Electron Motion ◽  
Energy Distributions ◽  
Pump Probe ◽  
X Ray ◽  
Probe Experiment ◽  
Oppenheimer Approximation ◽  
Internuclear Distances ◽  
Pump Probe Experiment

We probe the attosecond electron motion in [Formula: see text], at short internuclear distances, by exact numerical solution of the 3D time-dependent Schrödinger equation in the Born–Oppenheimer approximation. We simulate a pump-probe experiment to calculate the energy distributions of ionized electrons. We start the experiment with a pump pulse that creates a coherent electronic wavepacket combination of the 1sσg and 2pσu states. We let the electronic wavepacket oscillate during a time delay Δt. In the second step of the experiment, we submit the wavepacket to an intense attosecond X-ray laser pulse. We observe an asymmetry in the energy distributions of ionized electrons that allows the mapping of the attosecond electron motion in [Formula: see text].

Collinear pump probe experiment, novel approach to ultrafast spectroscopy

1999 ◽  
Vol 68 (4) ◽  
pp. 689-692 ◽  
Author(s):  
B. Bousquet ◽  
L. Canioni ◽  
J. Plantard ◽  
L. Sarger
Keyword(s):  
Ultrafast Spectroscopy ◽  
Pump Probe ◽  
Novel Approach ◽  
Probe Experiment ◽  
Pump Probe Experiment

Diamond channel-cut crystals for high-heat-load beam-multiplexing narrow-band X-ray monochromators

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Yuri Shvyd'ko ◽  
Sergey Terentyev ◽  
Vladimir Blank ◽  
Tomasz Kolodziej
Keyword(s):  
Heat Load ◽  
Narrow Band ◽  
Bragg Reflection ◽  
High Heat ◽  
High Repetition Rate ◽  
X Rays ◽  
Ray Optics ◽  
X Ray ◽  
Load Beam ◽  
High Heat Load

Next-generation high-brilliance X-ray photon sources call for new X-ray optics. Here we demonstrate the possibility of using monolithic diamond channel-cut crystals as high-heat-load beam-multiplexing narrow-band mechanically stable X-ray monochromators with high-power X-ray beams at cutting-edge high-repetition-rate X-ray free-electron laser (XFEL) facilities. The diamond channel-cut crystals fabricated and characterized in these studies are designed as two-bounce Bragg reflection monochromators directing 14.4 or 12.4 keV X-rays within a 15 meV bandwidth to 57Fe or 45Sc nuclear resonant scattering experiments, respectively. The crystal design allows out-of-band X-rays transmitted with minimal losses to alternative simultaneous experiments. Only ≲2% of the incident ∼100 W X-ray beam is absorbed in the 50 µm-thick first diamond crystal reflector, ensuring that the monochromator crystal is highly stable. Other X-ray optics applications of diamond channel-cut crystals are anticipated.

scholarly journals Probing calculatedO2+potential-energy curves with an XUV-IR pump-probe experiment

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
Philipp Cörlin ◽  
Andreas Fischer ◽  
Michael Schönwald ◽  
Alexander Sperl ◽  
Tomoya Mizuno ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Curves ◽  
Pump Probe ◽  
Probe Experiment ◽  
Pump Probe Experiment
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