Movies of electrons
In a paper published in the latest issue of Nature Photonics, an international team of researchers takes an important step toward giving physicists the ability to effectively make movies of individual electrons. If the approach pans out, it would provide a way to gather data of unprecedented detail about how individual molecules interact during chemical reactions, with ramifications for not only the basic sciences but chemical engineering and pharmaceutical research as well.The researchers, eight of whom are from MIT’s Research Laboratory of Electronics (RLE), describe a technique that should be able to produce bursts of laser light that last only attoseconds, or billionths of a billionth of a second. The electron in a hydrogen atom takes about 151 attoseconds to orbit the nucleus, so catching it in the act during a chemical reaction would require attosecond pulses.“If you can generate a pulse that has a shorter duration, then you can...