scholarly journals X-rays only when you want them: optimized pump–probe experiments using pseudo-single-bunch operation

2015 ◽  
Vol 22 (3) ◽  
pp. 729-735 ◽  
Author(s):  
M. P. Hertlein ◽  
A. Scholl ◽  
A. A. Cordones ◽  
J. H. Lee ◽  
K. Engelhorn ◽  
...  
Keyword(s):  
Laser Excitation ◽  
Ccd Camera ◽  
Single Shot ◽  
X Rays ◽  
Time Resolved ◽  
Pump Probe ◽  
Charge Coupled Device ◽  
X Ray ◽  
X Ray Absorption ◽  
Sample Damage

Laser pump–X-ray probe experiments require control over the X-ray pulse pattern and timing. Here, the first use of pseudo-single-bunch mode at the Advanced Light Source in picosecond time-resolved X-ray absorption experiments on solutions and solids is reported. In this mode the X-ray repetition rate is fully adjustable from single shot to 500 kHz, allowing it to be matched to typical laser excitation pulse rates. Suppressing undesired X-ray pulses considerably reduces detector noise and improves signal to noise in time-resolved experiments. In addition, dose-induced sample damage is considerably reduced, easing experimental setup and allowing the investigation of less robust samples. Single-shot X-ray exposures of a streak camera detector using a conventional non-gated charge-coupled device (CCD) camera are also demonstrated.

Time- and spatial-resolved XAFS spectroscopy in a single shot: new analytical possibilities forin situmaterial characterization

2016 ◽  
Vol 23 (3) ◽  
pp. 769-776 ◽  
Author(s):  
Ana Guilherme Buzanich ◽  
Martin Radtke ◽  
Uwe Reinholz ◽  
Heinrich Riesemeier ◽  
Franziska Emmerling
Keyword(s):  
Ccd Camera ◽  
Single Shot ◽  
Transmitted Beam ◽  
X Ray ◽  
Structure Information ◽  
Xafs Spectroscopy ◽  
Area Detector ◽  
Metal Foils ◽  
Set Up ◽  
X Ray Absorption

A new concept that comprises both time- and lateral-resolved X-ray absorption fine-structure information simultaneously in a single shot is presented. This uncomplicated set-up was tested at the BAMline at BESSY-II (Berlin, Germany). The primary broadband beam was generated by a double multilayer monochromator. The transmitted beam through the sample is diffracted by a convexly bent Si (111) crystal, producing a divergent beam. This, in turn, is collected by either an energy-sensitive area detector, the so-called color X-ray camera, or by an area-sensitive detector based on a CCD camera, in θ–2θ geometry. The first tests were performed with thin metal foils and some iron oxide mixtures. A time resolution of lower than 1 s together with a spatial resolution in one dimension of at least 50 µm is achieved.

Scintillating screen CCD camera using fast analog on-chip storage for time-resolved x-ray absorption spectroscopy

1995 ◽  
Author(s):  
Andreas Koch ◽  
Michael Hagelstein ◽  
Alfonso San Miguel ◽  
Alain Fontaine ◽  
Thorsten Ressler
Keyword(s):  
Absorption Spectroscopy ◽  
Ccd Camera ◽  
Time Resolved ◽  
X Ray ◽  
On Chip ◽  
X Ray Absorption

Soft X-ray excited colour-centre luminescence and XANES studies of calcium oxide

2007 ◽  
Vol 85 (10) ◽  
pp. 853-858 ◽  
Author(s):  
JY Peter Ko ◽  
Franziskus Heigl ◽  
Yun Mui Yiu ◽  
Xing-Tai Zhou ◽  
Tom Regier ◽  
...  
Keyword(s):  
Calcium Oxide ◽  
Density Functional ◽  
X Rays ◽  
Colour Centre ◽  
Time Resolved ◽  
Edge Structure ◽  
Colour Centres ◽  
X Ray ◽  
Optical Luminescence ◽  
X Ray Absorption

In this study, we show that colour centres can be produced by irradiating calcium oxide with soft X-rays from a synchrotron radiation source. Using the X-ray excited optical luminescence (XEOL) technique, two colour centres, F-centre, and F+-centre can be identified. These colour centres emit photons at characteristic wavelengths. In addition, by performing time-resolved XEOL (TRXEOL), we are able to reveal timing and decay characteristics of the colour centres. We also present X-ray absorption near-edge structure (XANES) spectra collected across oxygen K-edge, calcium L3,2-edge, and calcium K-edge. Experimental results are compared with density functional theory (DFT) calculations.Key words: calcium oxide, colour centre, synchrotron, X-ray excited optical luminescence, X-ray absorption near-edge structure.

Time-resolved soft x-ray absorption spectroscopy of silicon using femtosecond laser plasma x rays

1999 ◽  
Vol 75 (16) ◽  
pp. 2350-2352 ◽  
Author(s):  
Hidetoshi Nakano ◽  
Yoshinori Goto ◽  
Peixiang Lu ◽  
Tadashi Nishikawa ◽  
Naoshi Uesugi
Keyword(s):  
Femtosecond Laser ◽  
Absorption Spectroscopy ◽  
Laser Plasma ◽  
X Rays ◽  
Time Resolved ◽  
X Ray ◽  
Femtosecond Laser Plasma ◽  
X Ray Absorption

A new experimental setup for time- and laterally-resolved X-ray absorption fine structure spectroscopy in a ‘single shot’

2019 ◽  
Vol 34 (1) ◽  
pp. 239-246 ◽  
Author(s):  
A. Kulow ◽  
S. Witte ◽  
S. Beyer ◽  
A. Guilherme Buzanich ◽  
M. Radtke ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structural Changes ◽  
Chemical Compounds ◽  
Experimental Setup ◽  
Single Shot ◽  
Time Resolved ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

A new, simple and adjustable setup allows scanning-free XAS for time-resolved studies of structural changes in chemical compounds.

scholarly journals X-ray-induced sample damage at the Mn L-edge: a case study for soft X-ray spectroscopy of transition metal complexes in solution

2018 ◽  
Vol 20 (24) ◽  
pp. 16817-16827 ◽  
Author(s):  
Markus Kubin ◽  
Jan Kern ◽  
Meiyuan Guo ◽  
Erik Källman ◽  
Rolf Mitzner ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Absorption Spectroscopy ◽  
X Rays ◽  
X Ray ◽  
X Ray Absorption ◽  
Sample Damage ◽  
Dose Dependent

Dose-dependent damage to a Mniii complex in solution, induced by soft X-rays, is investigated with Mn L-edge X-ray absorption spectroscopy.

scholarly journals X-ray absorption spectroscopy with time-tagged photon counting: application to study the structure of a Co(i) intermediate of H2 evolving photo-catalyst

2014 ◽  
Vol 171 ◽  
pp. 259-273 ◽  
Author(s):  
Grigory Smolentsev ◽  
Alexander A. Guda ◽  
Markus Janousch ◽  
Cristophe Frieh ◽  
Gaudenz Jud ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Solvent Molecule ◽  
Photon Counting ◽  
Photochemical Reactions ◽  
Transient Signal ◽  
X Rays ◽  
Time Resolved ◽  
X Ray ◽  
Kinetic Information ◽  
X Ray Absorption

In order to probe the structure of reaction intermediates of photochemical reactions a new setup for laser-initiated time-resolved X-ray absorption (XAS) measurements has been developed. With this approach the arrival time of each photon in respect to the laser pulse is measured and therefore full kinetic information is obtained. All X-rays that reach the detector are used to measure this kinetic information and therefore the detection efficiency of this method is high. The newly developed setup is optimized for time-resolved experiments in the microsecond range for samples with relatively low metal concentration (∼1mM). This setup has been applied to study a multicomponent photocatalytic system with a Co(dmgBF2)2 catalyst (dmg2− = dimethylglyoximato dianion), [Ru(bpy)3]2+ chromophore (bpy = 2,2′-bipyridine) and methyl viologen as the electron relay. On the basis of the analysis of hundreds of Co K-edge XAS spectra corresponding to different delay times after the laser excitation of the chromophore, the presence of a Co(i) intermediate is confirmed. The calculated X-ray transient signal for a model of Co(i) state with a 0.14 Å displacement of Co out of the dmg ligand plane and with the closest solvent molecule at a distance of 2.06 Å gives reasonable agreement with the experimental data.

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