Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ultrafast imaging of complex systems in 3-D at near atomic resolution becoming increasingly possible

18.12.2014

It is becoming possible to image complex systems in 3-D with near-atomic resolution on ultrafast timescales using extremely intense X-ray free-electron laser (XFEL) pulses.

One important step toward ultrafast imaging of samples with a single X-ray shot is understanding the interaction of extremely brilliant and intense X-ray pulses with the sample, including ionization rates.

Scientists from the U.S. Department of Energy's Argonne National Laboratory and SLAC National Accelerator Laboratory developed an extended Monte Carlo computational scheme that for the first time includes bound-bound resonant excitations that dramatically enhance ionization rates and can lead to an unexpectedly high degree of electron stripping.

The extended computation scheme addresses a daunting challenge for the standard rate equation approach – managing the exponentially large number of electron configurations that can occur when one or more excitations occur. The scheme computes atomic data only on demand, that is, when a specific electronic configuration is accessed.

"This strategy allows for a natural and efficient way to identify the most probable path through the quadrillions of electronic configurations to the final state," Argonne Distinguished Fellow Linda Young said.

With the extended Monte Carlo rate equation (MCRE) model, the researchers studied the ionization dynamics of argon atoms that received a 480-electronvolt XFEL pulse, in which the resonance-enhanced X-ray multiple ionization mechanism was critical to generating otherwise inaccessible charge states.

“Based on the computer simulations, we can now understand the very efficient ionization of our samples beyond what was previously believed to be the physical limit,” said Christoph Bostedt, a senior staff scientist at SLAC. “Understanding the process gives you the means to control it.”

XFEL imaging capability relies on the diffract-before-destroy concept, in which a high-fluence, ultrashort X-ray pulse generates a diffraction pattern prior to Coulomb explosion; reconstruction of many such patterns will render a 3-D model.

Due to the massive number of electronic rearrangements – ranging into the billions and beyond – during the femtosecond X-ray pulse, it is important to gain a deep understanding of the dynamic response individual atoms have to intense X-ray pulses.

With the extended MCRE approach scientists not only gained the first theoretical verification of resonance-enhanced multiple ionization (REXMI) pathways for inner-shell ionization dynamics of argon atoms, but also verified the REXMI mechanism for previously observed ultra-efficient ionization in krypton and xenon.  The extended MCRE scheme makes possible the theoretical exploration of resonant high-intensity X-ray physics.

Hard XFEL pluses, such as those available at SLAC’s Linac Coherent Light Source (LCLS) where this experiment was conducted, provide unparalleled opportunities to characterize, down to the atomic level, complex systems on ultrafast time scales.

This research was funded by the U.S Department of Energy's Office of Science, Office of Basic Energy Sciences. The LCLS is a DOE Office of Science User Facility.

Phay Ho and Linda Young of Argonne and Christoph Bostedt and Sebastian Schorb of SLAC developed the extended Monte Carlo rate equation approach.

Also see "Theoretical Tracking of Resonance-Enhanced Multiple Ionization Pathways in X-Ray Free-Electron Laser Pulses" at the Physical Review Letters website.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.

SLAC is a multi-program laboratory exploring frontier questions in photon science, astrophysics, particle physics and accelerator research. Located in Menlo Park, Calif., SLAC is operated by Stanford University for the U.S. Department of Energy's Office of Science.

SLAC National Accelerator Laboratory is supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov

Tona Kunz | EurekAlert!

Further reports about: Energy SLAC Ultrafast X-ray X-ray pulse XFEL atomic resolution basic research complex systems ionization

More articles from Physics and Astronomy:

nachricht SF State astronomer searches for signs of life on Wolf 1061 exoplanet
20.01.2017 | San Francisco State University

nachricht Molecule flash mob
19.01.2017 | Technische Universität Wien

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>