STM


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STM

(Scanning Tunneling Microscope) A microscope that can image down to the atomic level. An STM uses a piezoelectric tube with a tiny sharp tip at the end that is moved within nanometers of the object being sampled. As it gets close, the voltage applied to the tip causes a "tunneling" current to flow to the object. As the tip is moved and bumps into an obstruction, the current changes. In order to maintain a certain constant current, the tip is raised and lowered accordingly, and this movement pattern is magnified and displayed on screen. See AFM, microscopy and nanotechnology.
References in periodicals archive ?
The largest change in DAWIA STM certification in recent years is in the training requirements, with two of the three required STM courses new for Fiscal Year (FY) 2016.
To release the cargo, the scientists use the STM tip to lift the HB-HBP molecule.
In general, these STM manipulations must take place at extremely low temperatures to keep the reactant molecules from randomly hopping around.
Because the STM can depict only electrically conducting surfaces, its ability to investigate many materials, such as biological samples, is limited.
To pull atoms out of a silicon surface where they are covalently bonded, Avouris and Lyo tap chemical forces that come into play when the STM tip nears the surface.
Looking at HOPG under an STM is "like looking at a marble floor in a bathroom: You can see anything you want to in it," Lindsay notes.
Last April, for instance, another IBM team reported it had written "IBM" by pushing individual xenon atoms into place with an STM, but this required supercold temperatures and a vacuum.
In another, they "corralled" molecules by encircling them with a computer-controlled STM tip.
Payload pointers: Cause of phase variation between an STM frame and its payload
function of those STM section and path overheads used by ATM equipment.
Bjorn Platou, General Manager of STM Norway, said, "We are delighted with the take up rates in our products, which demonstrate our customers' strong endorsement of STM and the performance and value proposition offered by our SatLink DVB-RCS compliant system.
The report includes market sizes, trends, and characteristics for both European online business information and STM markets; results and analysis from separate surveys of UK business information and STM information users; profiles of leading suppliers with financial data where available; forecasts for 2006 and 2007.