Featured Research

from universities, journals, and other organizations

UC Riverside Researcher Takes Snapshots Of The Movement Of Molecules In A Billionth Of A Second

Date:
August 6, 2004
Source:
University Of California - Riverside
Summary:
A team of researchers including University of California, Riverside Assistant Professor of Chemistry, Ludwig Bartels has developed a technique to take extremely fast snapshots of molecular and atomic movement. The development is considered a significant advance in surface science, the study of chemical reactions taking place on the surface of solids.

Illustration of the process of using femtosecond laser pulses to measure moleculr movement of carbon monoxide on a copper substrate.
Credit: Image courtesy of University Of California - Riverside

A team of researchers including University of California, Riverside Assistant Professor of Chemistry, Ludwig Bartels has developed a technique to take extremely fast snapshots of molecular and atomic movement. The development is considered a significant advance in surface science, the study of chemical reactions taking place on the surface of solids.

The results are reported in the current issue of the Journal Science and were also reported in the June 24 issue of Science Express... the online prerelease of the most important articles in Science. The article, "Real-Space Observation of Molecular Motion Induced by Femtosecond Laser Pulses," details how carbon monoxide molecules move on a copper substrate when hit with extremely rapid laser pulses - a femtosecond is one millionth of a nanosecond - and tracks their movements.

"It was possible to identify the individual site-to-site displacements of molecules undergoing ultra-fast dynamics induced by femtosecond laser pulses," Bartels said, characterizing the technique as a way of getting something akin to snapshots of the molecules' movements. Bartels' co-authors in the paper included Tony F. Heinz, Dietmar Mφller and Feng Wang of Columbia University; and Ernst Knoesel of Rowan University, Glassboro, NJ.

"Scanning probe microscopy has the capability of reaching directly down to the natural spatial scale of atoms and molecules," Bartels said. "While femtosecond laser techniques have the capability of reaching down to the time scale of atomic events.

"There has been considerable interest in the very challenging problem of combining these two capabilities," he added. "While we have not yet achieved the ultimate goal of a real-time, real-space movies, the current paper reports what we believe to be a very significant advance in combining the two very powerful techniques."

The new technique allows scientists to probe very important fundamental questions in surface science, according to Bartels and his co-authors. They include such questions as what substrate excitations drive surface diffusion of absorbates? Surface diffusion is a very basic and important process in surface science, playing a key role in processes as diverse as the formation of crystals and the activity of catalysts.

"This is very basic research but it has implications for many other areas in science," said Bartels. "Catalysts, like the one in the exhaust system in every car, are made from a porous material. The exhaust gas is passed through it and the pollutants such as carbon monoxide and nitric oxide can stick to the surface of the catalyst material."

A small portion of the catalyst surface can transform the pollutant into benign gasses while the rest of the surface supports these active sites. Understanding how carbon monoxide moves across a catalyst surface to find the active sites may ultimately allow the design of more efficient catalysts. The article's findings offer a new way of studying the very fast movement of carbon monoxide on surfaces.

The U.S. Department of Energy and the Air Force Office of Scientific Research support this research.


Story Source:

The above story is based on materials provided by University Of California - Riverside. Note: Materials may be edited for content and length.


Cite This Page:

University Of California - Riverside. "UC Riverside Researcher Takes Snapshots Of The Movement Of Molecules In A Billionth Of A Second." ScienceDaily. ScienceDaily, 6 August 2004. <www.sciencedaily.com/releases/2004/08/040805085624.htm>.
University Of California - Riverside. (2004, August 6). UC Riverside Researcher Takes Snapshots Of The Movement Of Molecules In A Billionth Of A Second. ScienceDaily. Retrieved August 28, 2014 from www.sciencedaily.com/releases/2004/08/040805085624.htm
University Of California - Riverside. "UC Riverside Researcher Takes Snapshots Of The Movement Of Molecules In A Billionth Of A Second." ScienceDaily. www.sciencedaily.com/releases/2004/08/040805085624.htm (accessed August 28, 2014).

Share This




More Matter & Energy News

Thursday, August 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Australian Airlines Relax Phone Ban Too

Australian Airlines Relax Phone Ban Too

Reuters - Business Video Online (Aug. 26, 2014) — Qantas and Virgin say passengers can use their smartphones and tablets throughout flights after a regulator relaxed a ban on electronic devices during take-off and landing. As Hayley Platt reports the move comes as the two domestic rivals are expected to post annual net losses later this week. Video provided by Reuters
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) — Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Chinese Researchers Might Be Creating Supersonic Submarine

Chinese Researchers Might Be Creating Supersonic Submarine

Newsy (Aug. 26, 2014) — Chinese researchers have expanded on Cold War-era tech and are closer to building a submarine that could reach the speed of sound. Video provided by Newsy
Powered by NewsLook.com
Breakingviews: India Coal Strained by Supreme Court Ruling

Breakingviews: India Coal Strained by Supreme Court Ruling

Reuters - Business Video Online (Aug. 26, 2014) — An acute coal shortage is likely to be aggravated as India's supreme court declared government coal allocations illegal, says Breakingviews' Peter Thal Larsen. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins