Rather than the light used in a traditional microscope, this technique uses
focused beams of electrons to illuminate a sample and form images with atomic resolution.
The microscope scans a sample with
a focused beam of electrons, and then measures how the electrons interact with the atoms in the sample.
Not exact matches
He's done so by precisely
focusing infrared laser light to selectively ionize, or steal the
electrons from, air molecules at the
beam's focal point, generating a flash
of bluish - white plasma.
So Banhart used a kind
of substitute soldercreated on the spotto link two crossed nanotubes: he
focused a narrow
beam of electrons from a scanning
electron microscope at the point where the tubes met, thereby converting contaminants on their surfaces into bridges made from graphite - like carbon that can conduct electricity.
This work has demonstrated a successful control
of a phase transformation from the layered SrNbO3.4 to the perovskite SrNbO3 with atomic precision by manipulating a
focused sub-Angström
electron beam to any selectable region.
The team, led by Prof. Yuichi Ikuhara, applied the
focused electron beam of a scanning transmission
electron microscope (STEM) to irradiate SrNbO3.4 crystals, and demonstrated a precise control
of a phase transformation from layered SrNbO3.4 to perovskite SrNbO3 at the atomic scale.
They used a scanning
electron microscope and
focused ion
beam to obtain thin - slice images
of the membrane, which they analyzed with software, rebuilding the three - dimensional structure
of the membranes to determine fuel cell longevity.
DARPA is looking at more efficient technologies, like fiber lasers and liquid lasers, which could lead to smaller, more compact devices, while the Navy is researching a Free
Electron Laser, an experimental technology that uses high - speed
electrons to generate an extremely powerful
focused beam of radiation.
The ultimate dream is to take STEM into three dimensions with confocal
electron microscopy, which images a material in slices by changing the
focus of the
beam.
«It's not a glass lens like you'd find in a camera,» Fischer said, «but we call the technique «
electron lensing» because, like a lens that
focuses light, the
electron beam changes the trajectory
of the protons flying through it.»
This is a cross-sectional scanning
electron microscopy images
of a 750 nm period grating fabricated by
focused ion
beam milling in a 300 nm thick amorphous germanium antimony telluride film on silica.
To identify the location
of each element with atomic precision, the researchers used a method in which the
electron beam of one
of the world's leading ultrahigh - resolution
electron microscopes is finely
focused, sent through the specimen and, by interactions with the specimen, loses part
of its energy.
I am an experimentalist, and I use ultrahigh - resolution ion - and
electron - microscopy techniques, including
focused - ion -
beam scanning -
electron microscopy and transmission
electron microscopy, to determine the composition and structure
of these materials at scales ranging from millimeters down to the atomic.
«Thanks to a new
focused - ion
beam sectioning system recently obtained by McGill's Facility for
Electron Microscopy Research, we were able to accurately and thinly cut the sample and image the interior
of the shell.»
The research team then
focused a
beam of vacuum ultraviolet light from the synchrotron on the heated gas mixture that knocked away
electrons (an effect known as ionization).
«What is really interesting to me is that you can potentially
focus the
beam down to a small size, and then you would really have a system that competes with X-ray free -
electron lasers,» Minor said, which opens up the possibility
of electron imaging
of single biological particles.
Filippetto has a goal to improve the
focus of the HiRES
electron beam from microns, or millionths
of a meter in diameter, to the nanometer scale (billionths
of a meter), and to also improve the timing from hundredths
of femtoseconds to tens
of femtoseconds to boost the quality
of the images it produces and also to study even faster processes at the atomic scale.
This disk (0.02
of an inch in diameter) is a slice
of one
of the thousands
of electrodes that ruptured when a self -
focused, relativistic
electron beam pinched into a 630,000,000 °F «hot dot» that was only 4 billionths
of an inch in diameter.
As the Ukrainian experiments have shown, with small amounts
of energy, significant fusion (and fission) can occur in 10 - 8 second with a self -
focused (Z - pinched)
electron beam in a high - density plasma.116