This is incredible: Brown University physicists Humphrey Maris and Wei Guo were able to observe (and film) the motion of a single electron!
To observe the motion of an electron – an elementary particle with a mass that is one billionth of a billionth of a billionth of a gram – has been considered to be impossible. So when two Brown University physicists showed movies of electrons moving through liquid helium at the 2006 International Symposium on Quantum Fluids and Solids in Kyoto, they raised some eyebrows.
The images, which were published online on May 31, 2007, in the Journal of Low Temperature Physics, show scattered points of light moving down the screen – some in straight lines, some following a snakelike path. The Matrix it’s not. Still, the fact that they can be seen at all is astounding. “We were astonished when we first saw an electron moving across the screen,” said Humphrey Maris, a professor of physics at Brown University. “Once we had the idea, setting it up was surprisingly easy.”