The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

Optical Surfaces Ltd has delivered a 305 mm diameter spherical mirror to the GSI Helmholtz Zentrum für Schwerionenforschung in Germany for use in novel particle acceleration experiments.

and in this communication a method is proposed for measuring the temperature and the relative density of electrons in a plasma from the Doppler broadening and the intensity of light scattered from ...