A color JPEG image of a figure that illustrates an experiment
modeled by Hua-Chieh Shao and Anthony Starace. It shows
the 110-attosecond electron pulse sent through a beam of
hydrogen atoms (green) excited by a laser (red).
(PhysOrg.com) -- A long-standing goal of science is to be able to
understand how matter behaves at the atomic and subatomic level.