Field ion micrograph of tungsten. The coloured dots are the locations of individual atoms; the ring-like patterns are facets of a single crystal of the metal. The image was made by superimposing successive micrographs,taken with different col- our filters,to show small changes on the surface. Field-ion microscopy involves placing a tiny needle of a substance,such as tungsten,in a gas- filled chamber & passing a high voltage through it. The drifting gas ions hit the charged atoms & are repelled at right angles to form this pattern on a screen | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Cranstoun, Dr. G.K.L. |
Taille de l’image : | 4961 px × 3740 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |