Extremely short electron packets are the key to many new applications such as ultrafast electron microscopy and laboratory-scale free-electron lasers.…
Periodic atomic motions on a length scale of one-billionth of a millionth of a meter (10-15 m) are imaged by means of ultrashort x-ray pulses. In this…
The fact that light has to be understood either as an electromagnetic wave or as a stream of "energy quanta" (photons) pervades the history of quantum…