New Electron Microscope Shows Atoms in Color

Cornell's Duffield Hall has acquired a new electron microscope that is enabling scientists to see individual atoms in color for the very first time. While old electron microscopes can be compared to black and white cameras, this new scanning transmission electron microscope uses a new aberration-correction technology that is both more intense and allows for faster imaging speed. "The method also can show how atoms are bonded to one another in a crystal, because the bonding creates small shifts in the energy signatures. In earlier STEMs, many electrons from the beam, including those with changed energies, were scattered at wide angles by simple collisions with atoms. The new STEM includes magnetic lenses that collect emerging electrons over a wider angle. Previously, Silcox said, about 8 percent of the emerging electrons were collected, but the new detector collects about 80 percent, allowing more accurate readings of the small changes in energy levels that reveal bonding between atoms."

Comments

Atoms don't have color!

[ramk13]

At least not how they are implying. Color as most people think of it has to do with absorbed, reflected and transmitted light. The arrangement of the atoms as much as the atoms themselves affect color. But individual atoms in a crystal don't have color, at least as most people understand. The headline makes it seems like you could come away saying, "So iron atoms really are red..." or something equivalently silly.

Re:This thread is useless without pics!

[pushing-robot]

Picture here.

Re:Not color, false color.

[kebes]

I'm not sure what the actual innovation is here. Using false-color in an image is certainly not the innovation. What is innovative is their use of corrective optics to achieve much higher signal (100-fold increase compared to conventional techniques), and the integration of energy-loss spectroscopy. This means that for each pixel in the image, they can determine what kind of atom is being measured. So they can generate false-color maps of atomic identity. Most electron microscopes simply measure electron density: you can guess which element is which based on density, but there can be ambiguities. Some microscopes include detectors for determining what elements are present, but not with high spatial resolution. This new refinement allows precise maps where individual atoms can be both localized, and elementally identified.

The image they show is impressive when you consider that each blob of color is actually an individual atom, and that they've identified exactly what kind of atom is at each position. In this case they were using it to analyze interdiffusion of atoms at an interface. As nanotechnology becomes more and more 'real' you can imagine how useful it will be to image nano-objects with atomic resolution and elemental discrimination.

Re:Not color, false color.

[koolguy442]

Not to get too technical here, but each blob is actually a column of atoms, as the specimen is wedge-shaped and certainly more than one atomic layer thick.

Electron energy-loss spectroscopy (EELS) has been combined with STEM imaging for several years at least, allowing similar sorts of images to be synthesized. The major contribution of this work is that they've modified the optics so that, even at 0.5 angstrom beam widths (and hence pixel sizes), they still get enough signal to the EELS detector to allow for EELS mapping and spectra acquisition for each of those pixels, giving direct bonding information about the particular portions of atoms probed by the beam. That means that the researchers can tell the difference between titanium atomic columns at different locations within the crystal, depending on the other atoms surrounding them.

Well, I suppose I did end up getting too technical.

IAATEL (I am a transmission electron microscopist)

Screenshot

[peterpi]

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