Doppler effect: a variation in the infinitely small

Thanks to an experimental setup unique in the world, a team of researchers from the Laboratory of Physical Chemistry - Matter and Radiation (UMPC /CNRS), the Free University of Berlin in Germany, Uppsala University in Sweden and the SOLEIL Synchrotron, have just shown, microscopically, the importance of the Doppler effect, a phenomenon better known on a macroscopic scale. In their study, published in Nature Communications, they were interested in high-energy electron emissions from single atoms.