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Andres Tretiakov, a laboratory technician at a high school in London, had read that iodine vapor fluoresces when excited by a helium-neon laser. So he decided to give it a go. After heating a few solid iodine crystals so they’d sublime—turn from solid to gas—he shined his green laser pointer through the flask. “To my surprise, I saw that it had worked,” Tretiakov says. The iodine vapor glowed orangey yellow when excited by the laser light, which had a wavelength of 532 nm.
Submitted by Andres Tretiakov
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