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Conventional wisdom supposes that ions in supersaturated solution simply transforms into cubic crystals. However, experiments have shown that when certain substances crystallize (e.g., NaCl) from solution they emit blue light - crystalloluminescence. This is only possible if some of the ions transform into radicals (neutral atoms with unpaired electrons) and then turn back into ions while releasing this energy in the form of photons.

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Document Title: Crystalloluminescence: From ions to radicals and back again
Category: Chemistry
Media Type: Graphics
Date of Image/Photo: August 24, 2011
Background:
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/DRAE-8L3NTL

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