scholarly journals Time-resolved ion imaging at free-electron lasers using TimepixCam

2018 ◽  
Vol 25 (2) ◽  
pp. 336-345 ◽  
Author(s):  
Merlin Fisher-Levine ◽  
Rebecca Boll ◽  
Farzaneh Ziaee ◽  
Cédric Bomme ◽  
Benjamin Erk ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Ion Imaging ◽  
Time Resolved ◽  
Pump Probe ◽  
Angular Correlations ◽  
Timing Resolution ◽  
Fragment Ions ◽  
Single Fragment ◽  
Molecular Photoionization

The application of a novel fast optical-imaging camera, TimepixCam, to molecular photoionization experiments using the velocity-map imaging technique at a free-electron laser is described. TimepixCam is a 256 × 256 pixel CMOS camera that is able to detect and time-stamp ion hits with 20 ns timing resolution, thus making it possible to record ion momentum images for all fragment ions simultaneously and avoiding the need to gate the detector on a single fragment. This allows the recording of significantly more data within a given amount of beam time and is particularly useful for pump–probe experiments, where drifts, for example, in the timing and pulse energy of the free-electron laser, severely limit the comparability of pump–probe scans for different fragments taken consecutively. In principle, this also allows ion–ion covariance or coincidence techniques to be applied to determine angular correlations between fragments.

scholarly journals Pump-Probe Time-Resolved Serial Femtosecond Crystallography at SACLA: Current Status and Data Collection Strategies

2019 ◽  
Vol 9 (24) ◽  
pp. 5505 ◽  
Author(s):  
Eriko Nango ◽  
Minoru Kubo ◽  
Kensuke Tono ◽  
So Iwata
Keyword(s):  
Data Collection ◽  
Free Electron ◽  
Free Electron Laser ◽  
Current Status ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
Collection Strategies ◽  
Serial Femtosecond Crystallography

Structural information on protein dynamics is a critical factor in fully understanding the protein functions. Pump-probe time-resolved serial femtosecond crystallography (TR-SFX) is a recently established technique for visualizing the structural changes or reactions in proteins that are at work with high spatial and temporal resolution. In the pump-probe method, protein microcrystals are continuously delivered from an injector and exposed to an X-ray free-electron laser (XFEL) pulse after a trigger to initiate a reaction, such as light, chemicals, temperature, and electric field, which affords the structural snapshots of intermediates that occur in the protein. We are in the process of developing the device and techniques for pump-probe TR-SFX while using XFEL produced at SPring-8 Angstrom Compact Free-Electron Laser (SACLA). In this paper, we described our current development details and data collection strategies for the optical pump X-ray probe TR-SFX experiment at SACLA and then reported the techniques of in crystallo TR spectroscopy, which is useful in clarifying the nature of reaction that takes place in crystals in advance.

scholarly journals Approach of Serial Crystallography II

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 655
Author(s):  
Ki-Hyun Nam
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Cryogenic Temperature ◽  
Research Trends ◽  
Special Issue ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
Fluctuation Dynamics ◽  
Serial Crystallography

Serial crystallography (SX) is an emerging X-ray crystallographic method for determining macromolecule structures. It can address concerns regarding the limitations of data collected by conventional crystallography techniques, which require cryogenic-temperature environments and allow crystals to accumulate radiation damage. Time-resolved SX studies using the pump-probe methodology provide useful information for understanding macromolecular mechanisms and structure fluctuation dynamics. This Special Issue deals with the serial crystallography approach using an X-ray free electron laser (XFEL) and synchrotron X-ray source, and reviews recent SX research involving synchrotron use. These reports provide insights into future serial crystallography research trends and approaches.

scholarly journals Observation of a highly conductive warm dense state of water with ultrafast pump–probe free-electron-laser measurements

2021 ◽  
Vol 6 (5) ◽  
pp. 054401
Author(s):  
Z. Chen ◽  
X. Na ◽  
C. B. Curry ◽  
S. Liang ◽  
M. French ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Pump Probe ◽  
Laser Measurements ◽  
State Of Water ◽  
Dense State

scholarly journals Double chirp-taper x-ray free-electron laser for attosecond pump-probe experiments

2019 ◽  
Vol 22 (5) ◽  
Author(s):  
Zhen Zhang ◽  
Joseph Duris ◽  
James P. MacArthur ◽  
Zhirong Huang ◽  
Agostino Marinelli
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Pump Probe ◽  
X Ray

scholarly journals Two - Color Mid-Infrared Spectroscopy of Isoelectronic Centers in Silicon

2003 ◽  
Vol 770 ◽  
Author(s):  
N.Q. Vinh ◽  
T. Gregorkiewicz
Keyword(s):  
Excited States ◽  
Free Electron ◽  
Free Electron Laser ◽  
Materials Science ◽  
Time Resolved ◽  
Mid Infrared ◽  
Semiconductor Physics ◽  
Open Questions ◽  
Time Resolved Photoluminescence ◽  
Tunable Source

AbstractOne of the open questions in semiconductor physics is the origin of the small splittings of the excited states of bound excitons in silicon. A free electron laser as a tunable source of the mid-infrared radiation (MIR) can be used to investigate such splittings of the excited states of optical centers created by transition metal dopants in silicon. In the current study, the photoluminescence from silver and copper doped silicon is investigated by two color spectroscopy in the visible and the MIR. It is shown the PL due recombination of exciton bound to Ag and Cu is quenched upon application of the MIR beam. The time-resolved photoluminescence measurements and the quenching effects of these bands are presented. By scanning the wavelength of the free-electron laser ionization spectra of relevant traps involved in photoluminescence are obtained. The formation and dissociation of the bound excitons, and the small splittings of the effective-mass excited states are discussed. The applied experimental method allows correlation of DLTS data on trapping centers to specific channels of radiative recombination. It can be applied for spectroscopic analysis in materials science of semicondutors.

scholarly journals Time-resolved photoelectron imaging using a femtosecond UV laser and a VUV free-electron laser

2010 ◽  
Vol 81 (3) ◽  
Author(s):  
S. Y. Liu ◽  
Y. Ogi ◽  
T. Fuji ◽  
K. Nishizawa ◽  
T. Horio ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Uv Laser ◽  
Photoelectron Imaging ◽  
Time Resolved

Time-Resolved Serial Femtosecond Crystallography at the European X-ray Free Electron Laser

2019 ◽  
Author(s):  
Marius Schmidt ◽  
Suraj Pandey ◽  
Adrian Mancuso ◽  
Richard Bean
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Crystallographic Data ◽  
Time Resolved ◽  
X Ray ◽  
Serial Femtosecond Crystallography

Abstract This protocol introduces step by step into the collection of time resolved crystallographic data and their analysis at the European Free Electron Laser.

scholarly journals Demonstration of Transmission Mode Soft X-ray NEXAFS Using Third- and Fifth-Order Harmonics of FEL Radiation at SACLA BL1

2020 ◽  
Vol 10 (21) ◽  
pp. 7852
Author(s):  
Hiroshi Iwayama ◽  
Masanari Nagasaka ◽  
Ichiro Inoue ◽  
Shigeki Owada ◽  
Makina Yabashi ◽  
...  
Keyword(s):  
Fine Structure ◽  
Free Electron ◽  
Free Electron Laser ◽  
Transmission Mode ◽  
Pump Probe ◽  
X Ray ◽  
The Third ◽  
Nexafs Spectroscopy ◽  
Fifth Order ◽  
X Ray Absorption

We demonstrate the applicability of third- and fifth-order harmonics of free-electron laser (FEL) radiation for soft X-ray absorption spectroscopy in the transmission mode at SACLA BL1, which covers a photon energy range of 20 to 150 eV in the fundamental FEL radiation. By using the third- and fifth-order harmonics of the FEL radiation, we successfully recorded near-edge X-ray absorption fine structure (NEXAFS) spectra for Ar 2p core ionization and CO2 C 1s and O 1s core ionizations. Our results show that the utilization of third- and fifth-order harmonics can significantly extend the available photon energies for NEXAFS spectroscopy using an FEL and opens the door to femtosecond pump-probe NEXAFS using a soft X-ray FEL.

Sign in / Sign up

Export Citation Format

Share Document