Navigation Links
Watching electrons move in real time
Date:9/21/2010

This release is also available in Chinese on EurekAlert! Chinese.

Washington, D.C. (September 21, 2010) -- At its most basic level, understanding chemistry means understanding what electrons are doing. Research published in The Journal of Chemical Physics not only maps the movement of electrons in real time but also observes a concerted electron and proton transfer that is quite different from any previously known phase transitions in the model crystal, ammonium sulfate. By extending X-ray powder diffraction into the femtosecond realm, the researchers were able to map the relocation of charges in the ammonium sulfate crystal after they were displaced by photoexcitation.

"Our prototype experiment produces a sort of 'molecular movie' of the atoms in action," says author Michael Woerner of the Max-Born-Institut fr Nichtlineare Optik und Kurzzeitspektroskopie in Germany. "The time and spatial resolution is now at atomic time and length scales, respectively."

Electron positions were mapped by observing the diffraction of X-ray pulses lasting tens of femtoseconds (quadrillionth of a second). Positions of protons and other nuclei were deduced from the locations of regions of high electron density. Within the crystal, the excited electrons transferred from the sulfate groups to a tight channel within crystal matrix. This channel was stabilized by the transfer of protons from adjacent ammonium groups into the channel. This transfer mechanism had not been previously observed or proposed, and the researchers had expected to see much smaller displacements.

According to Woerner, the technique should be applicable to structural studies of materials ranging from biomolecules to high-temperature superconductors. "We expect that the technique will be applied to many interesting material systems." He says. "In principle, femtosecond X-ray powder diffraction can be applied to any crystalline form of matter. Only the complexity of crystals and the presence of heavy elements, which reduces the penetration depth of X-rays, set some constraints."


'/>"/>

Contact: Jason Socrates Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

Related biology news :

1. Europe and China watching Earth together
2. Watching movies featuring characters who smoke negatively influences Mexican-American teens
3. Scientists show theres nothing boring about watching paint dry
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed Anwar ... prestigious international IAIR Award for the most innovative high security ePassport and ... ... Maldives Immigration Controller General, Mr. Mohamed ... the right) have received the IAIR award for the "Most innovative high ...
(Date:3/22/2017)...   Neurotechnology , a provider of high-precision ... the release of the SentiVeillance 6.0 ... recognition using up to 10 surveillance, security and ... new version uses deep neural-network-based facial detection and ... a Graphing Processing Unit (GPU) for enhanced speed. ...
(Date:3/20/2017)... PMD Healthcare announces the release of its ... System (WMS), a remote, real-time lung health monitoring and ... is a Medical Device, Digital Health, and Chronic Care ... innovative solutions that empower people to improve their healthcare ... developed the first ever personal spirometer, Spiro PD, which ...
Breaking Biology News(10 mins):
(Date:6/20/2017)... ... ... Biologist Dawn Maslar MS has found a biomarker that she claims verifies ... The Neuroscience of Meeting, Dating, Losing Your Mind, and Finding True Love, Maslar found ... step, in my estimation, was to scientifically track the evidence of commitment in men,” ...
(Date:6/20/2017)... ... June 20, 2017 , ... GigaGen Inc ., a ... repertoires, announces launch of its new Surge(TM) Discovery service at the ... GigaGen, will present on Surge at the conference. , Surge is the new, ...
(Date:6/16/2017)... ... 2017 , ... Cognition Corporation , a software company ... of its “From the Helm” Webinar Series. , The next two free ... design control exercises. Led by David Cronin, Cognition’s CEO, the half-hour public webinars ...
(Date:6/15/2017)... ... June 15, 2017 , ... The ... an artist’s journey through creative experimentation and interdisciplinary collaboration. Feature Creep, a solo ... 22nd. An opening reception will be held at EKG, located at 3600 Market ...
Breaking Biology Technology: