Researchers develop new advanced scanning transmission electron microscopy technique

Jun 26, 2012
The scanning transmission electron microscope used in the experiment and a conceptual depiction of the new technique.

(Phys.org) -- A new high-tech method for imaging the electric fields of atoms could lead to advances in areas as diverse as data storage, solar cells and batteries.

Research published today in the journal detailed how physicists from Monash University and Japanese institutions including the University of Tokyo and the Japan Science and Technology Agency viewed the electric fields of using a new advanced scanning technique.

Electric fields are produced by the electrically-charged particles within atoms known as protons and electrons. The electrical forces between the positively and negatively charged particles play an important structural role - they hold the atoms together.

By visualising the pattern of the fields produced by these charges, scientists will gain further insight into the electrical properties of materials. For instance, being able to manufacture electric field patterns on small length scales is a route to high capacity data storage.

Co-author Dr Scott Findlay of Monash University's School of Physics said the technique he developed with his Japanese colleagues was a breakthrough.

"Electron microscopy is a fast-developing field. Recent advances have let us see where individual atoms sit in a material, but it has been much harder to see their electric fields," Dr Findlay said.

The new technique allows the researchers to view electric field patterns by the deflections they induced in a beam of electrons.

"It’s like rolling marbles to look for slight slopes in the ground. If the marble deflects to the left, that must be downhill; if the beam of electrons deflects to the left, that must be the direction the field points," Dr Findlay said.

Dr Findlay said that viewing materials on the atomic level gave an entirely new perspective.

"We're seeing things that we've never seen before. Understanding the behaviour of materials and their electric fields on a very small scale expands what we are able to do with them," Dr Findlay said.

A number of groups internationally had been working on picturing electric fields. Dr Findlay will continue to work with collaborators in Japan to further refine their technique and apply it to developing new materials.

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antialias_physorg
not rated yet Jun 26, 2012
The electrical forces between the positively and negatively charged particles play an important structural role - they hold the atoms together

This isn't quite correct. Electrical forces hold the electrons close to the protons, but the protons in the nucleaus would fly appart (with terrific force*) if they weren't held together by the extremely strong but also extremely short range 'strong nuclear force'.

*The force of the atom bomb comes from the electrostatic repulsion of protons in unstable nuclei - not from the nuclear forces. The nuclear forces are actually a negative component to the energy released in a nuclear blast. So we really only have an 'electrostatic bomb' not a 'nuclear bomb'.
vacuum-mechanics
1 / 5 (1) Jun 26, 2012
By the way, talking about electron microscope which based on wave property of electron, it is interesting to note that nowadays conventional physics still could not understand why and how electron has both wave and particle properties. May be this unconventional view could give some idea.
http://www.vacuum...id=17=en