Laserpulse werden auf eine Metallspitze geschossen und lösen Elektronen heraus.
Sharp metal needles can be used to emit electrons. A quantum effect opens up new possibilities of controlling electron emission with extremely high accuracy. In an electron microscope, electrons are emitted by pointy metal tips, that way the can be steered and controlled with high precision. Recently, such metal tips have also been used as high precision electron sources for generating x-rays. A team of researchers at TU Wien (Vienna), together with colleagues from the FAU Erlangen-Nürnberg (Germany), have developed a method of controlling electron emission with higher precision than ever before. With the help of two different laser pulses it is now possible to switch the flow of electrons on and off on extremely short time scales. It's Just the Tip of the Needle - 'The basic idea resembles a lightning rod', says Christoph Lemell (TU Wien).
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