Imagine an action that occurs within a femtosecond, or one-quadrillionth of a second: atomic transitions, charge transfers and dynamics, biochemical processes. Now imagine being able to record that action so it can be studied in further detail.
Purdue University engineers are developing a patent-pending tool that scientists in academia and industry can use to record those ultrafast actions better than with traditional technology.Traditional electronic-based streak cameras are essential for recording phenomena that last mere picoseconds, or one-trillionth of a second.
"Think of the electrons like water coming out of a hose and the detector like dry pavement," Fruhling said."If a person quickly pulls the hose to the side, the water before the hose moved continues to go straight; the water that comes out during the motion is displaced to the side. In this way, the water that comes out of the hose at different times lands in different positions on the pavement.
"If someone wants to measure something really fast—for example, a person slicing their hand through the water—scientists can look at the pavement where theHowever, traditional electronic-based streak cameras, which use today's fastest"There are some processes that occur in 100 femtoseconds or less; a femtosecond is one-quadrillionth of a second," Fruhling said."But today's commercial electronic-based streak cameras can only resolve 600 to 800 femtoseconds.
"The technology could be utilized by physicists and engineers who want to study ultrafast processes like atomic transitions, by chemists who study charge transfer in reactions, and by biologists who want to study protein folding. It could also be used for companies that want to study the charge dynamics in next-generation computer chips.""We have shown that thecan be dramatically changed over about 100 femtoseconds," Fruhling said.
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