Electronic stroboscope showed the movement of individual atoms

November 26, 2008, 7:03 am

electronic stroboscope showed the movement of individual atoms   So stroboscopic effect of each of us is familiar not by hearsay - that is, on the basis of this phenomenon is based modern television system, when a second display only 24 frames, and smooth motion due to inertia of human view. However, stroboscopic effect is not just entertainment - it is used for scientific observation and study of rapid recurrent movements. In the latter case, illuminated by short flashes of light moving object appears to an observer moving.
In the latter case, you can explore very high-speed processes, the duration of which may be of a second. But the most interesting thing is that this technique allows to observe processes at the micro level, the duration of not more than a few pikosekund. But this requires the use of very short and frequent outbreaks to illuminate the study object, and that role perfectly handle electronic beams to observe the movement of individual atoms.
The developer of a new study ultrabystryh processes at the micro level, became the holder of the Nobel Prize for the study of chemical reactions, speed not exceeding a few femtosekund, Ahmed Zevayl (Ahmed Zewail), member of University of California (California Institute of Technology) . The method has received the designation ultrabystroy electron microscopy.
As we have pointed out to examine the processes used by the flow of electrons generated as follows:using laser light is carried out cathode microscope short duration of some hundred femtosekund, pulses of ultraviolet radiation. Bombing cathode photons leads to a flow of electrons of the same duration, the number of electrons vybityh is only a few dozen.
Such short electronic flash worked as a short flash of light in more familiar to the man in the street devices - projectors, television systems, etc. The result is a clearer picture of extremely high-speed, for example, the movement of individual atoms, molecules, DNA behavior, etc. Thus, researchers have produced at its disposal a unique tool to study previously inaccessible to monitor processes at the micro level. In the future, this technology will get its development - now scientists managed to get pulses of light lasting only 80 attosekund, which means that soon it will be possible to carry out surveillance of high-speed processes with high-resolution on the scale of time.


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