Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Film production in 4D with ultrashort electron pulses

27.10.2015

Physicists of the Ludwig-Maximilians-Universität Munich and the Max Planck Institute of Quantum Optics shorten electron pulses down to 30 femtoseconds duration. This enables them to gain detailed insight into atomic motions in molecules.

Electrons are odd particles: they have both wave and particle properties. Electron microscopy has been taking advantage of this phenomenon for roughly a century now and grants us a direct insight into the fundamental components of matter: molecules and atoms.


If ultrashort electron pulses hit a biomolecular crystal, they are diffracted from it. As a result, one obtains a characteristic diffraction image of the atomic structure.

Graphic: Alexander Gliserin

For a long time, still images were provided, but for some years now scientists are making tremendous progress in short-pulse technology. They create beams of electron pulses, which can, due to their extremely short flashing, provide us with very sharp images of moving atoms and electrons. Nevertheless, some of the fastest processes still remained blurred.

A team of the Laboratory for Attosecond Physics (LAP) from the Ludwig-Maximilians-Universität (LMU) and the Max Planck Institute of Quantum Optics (MPQ) has now managed to shorten electron pulses down to 28 femtoseconds in duration. One femtosecond is a millionth of a billionth of a second (10 to the minus 15 s). Such shutter speeds enable us to directly observe the truly fundamental motions of atoms and molecules in solids, similar to stroboscopy.

Those who want to explore the microcosm and its dynamics need a high-speed camera for atoms. In order to sharply capture motions of such particles during a reaction, one needs to work with “shutter speeds” in the range of femtoseconds, since this is the speed of reactions in molecules and solids. Commonly, femtosecond-short shutter speeds are provided by short-pulse laser technology, but laser light is not able to spatially resolve atoms.

Scientists from the Laboratory for Attosecond Physics at LMU and MPQ have now succeeded in producing ultrashort electron pulses with a duration of only 28 femtoseconds. This is six times shorter than ever before. The length of the matter wave is only about eight picometers; one picometer is a trillionth of a meter (10 to the minus 12 m).

Due to this short wavelength, it is possible to visualize even single atoms in diffraction experiments. If such electrons meet a molecule or atom, they are diffracted into specific directions due to their short wavelength. This way they generate an interference pattern at the detector from which an atomic 3D-structure of the examined substance is reconstructed. If the pulses are short enough, a sharp snapshot of the movement is the result.

To test the new technique, the physicists applied their ultrashort electron pulses to a biomolecule in a diffraction experiment. It is planned to use those electron beams for pump-probe experiments: an optical laser pulse is sent to the sample, initiating a response. Shortly afterwards the electron pulses produce a diffraction image of the structure at a sharp instant in time.

A large amount of such snapshots at varying delay times between the initiating laser pulses and the electron pulses then results in a film showing the atomic motion within the substance. Thanks to the sub-atomic wavelength of the electrons, one therefore obtains a spatial image as well as the dynamics. Altogether this results in a four-dimensional impression of molecules and their atomic motions during a reaction.

„With our ultrashort electron pulses, we are now able to gain a much more detailed insight into processes happening within solids and molecules than before“, Dr. Peter Baum says. „We are now able to record the fastest known atomic motions in four dimensions, namely in space and time“. Now the physicists aim to further reduce the duration of their electron pulses. The shorter the shutter speed becomes, the faster the motions which can be recorded. The aim of the scientists is to eventually observe even the much faster motions of electrons in light-driven processes. Thorsten Naeser

Original Publication:

A. Gliserin, M. Walbran, F. Krausz, P. Baum
Sub-phonon-period compression of electron pulses for atomic diffraction
Nature Communications, 27 October 2015, doi: 10.1038/ncomms9723

Contact:

Dr. Peter Baum
Max Planck Institute of Quantum Optics
Ludwig-Maximilians-Universität Munich
Am Coulombwall 1, 85748 Garching
Phone: +49 (0)89 / 289 - 14102
E-mail: peter.baum@lmu.de

Prof. Dr. Ferenc Krausz
Chair of Experimental Physics,
Ludwig-Maximilians-Universität Munich
Laboratory for Attosecond Physics
Director at Max Planck Institute of Quantum Optics, Garching, Germany
Phone: +49 (0)89 32 905 - 600
Telefax: +49 (0)89 32 905 - 649
E-mail: ferenc.krausz@mpq.mpg.de

Dr. Olivia Meyer-Streng
Press & Public Relations
Max Planck Institute of Quantum Optics, Garching, Germany
Phone: +49 (0)89 32 905 -213
E-mail: olivia.meyer-streng@mpq.mpg.de

Dr. Olivia Meyer-Streng | Max-Planck-Institut für Quantenoptik
Further information:
http://www.mpq.mpg.de/

More articles from Physics and Astronomy:

nachricht Witnessing turbulent motion in the atmosphere of a distant star
23.08.2017 | Max-Planck-Institut für Radioastronomie

nachricht Heating quantum matter: A novel view on topology
22.08.2017 | Université libre de Bruxelles

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: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>