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Like a scene out of Star Trek, Oxford scientists have created a transparent form of aluminium[...]a short pulse from the FLASH laser ‘knocked out’ a core electron from every aluminium atom in a sample without disrupting the metal’s crystalline structure.This turned the aluminium nearly invisible to extreme ultraviolet radiation.[...]The Oxford team ... focused all this power down into a spot with a diameter less than a twentieth of the width of a human hair. At such high intensities the aluminium turned transparent.[...]the invisible effect lasted for only an extremely brief period - an estimated 40 femtoseconds
Exposing aluminium to this X-Ray wavelength will promote all the inner-shell electrons to a higher shell.