Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > News > EELS Finds Atoms: Electron energy loss spectroscopy pinpoints single-atom impurities in solids

July 6th, 2009

EELS Finds Atoms: Electron energy loss spectroscopy pinpoints single-atom impurities in solids

Abstract:
Researchers in Japan have pushed to the single-atom limit the sensitivity of the chemical spectroscopy method called electron energy loss spectroscopy (EELS). The advance in EELS's analytical resolving power provides scientists the ability to pinpoint in solids the locations of lone atoms such as impurities and identify them chemically (Nat. Chem., DOI: 10.1038/nchem.282).

In an EELS experiment, researchers irradiate a solid specimen with an electron beam and measure the element-specific decrease in beam energy (the energy loss) caused by interactions between the beam and sample atoms. Commonly used in conjunction with transmission electron microscopy (TEM), EELS can often reveal the chemical identity of atoms in the nanometer-sized area probed by the TEM beam.

A standard way to boost the spatial resolution of both methods is to increase the beam energy (up to about 400 keV), which narrows the electron beam toward atomic dimensions. But therein lies a trade-off: Raising the acceleration voltage focuses the beam but typically destroys sample structures. Lowering the beam energy spares the specimen but destroys the focus. Both problems dash chances for single-atom analysis.

Source:
acs.org

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Chemistry

How does enzymatic pretreatment affect the nanostructure and reaction space of lignocellulosic biomass? December 18th, 2014

The gold standard December 9th, 2014

Simple, Biocompatible Method Developed for Production of Cerium Oxide Nanoparticles December 9th, 2014

Nanocatalysts Can Reduce Pollution Caused by Diesel Engines December 4th, 2014

Discoveries

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Announcements

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Tools

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

ORNL microscopy pencils patterns in polymers at the nanoscale December 17th, 2014

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE