Wikipedia:POTD row/October 13, 2006
From Wikipedia, the free encyclopedia
 |
The central electrode of a plasma lamp, showing a glowing blue plasma streaming upwards. The colors are a result of the radiative recombination of electrons and ions and the relaxation of electrons in excited states back to lower energy states. These processes emit light in a spectrum characteristic of the gas being excited. Photo credit: Blaise Frazier |
