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    De-tect-ing Gas Im-pur-it-ies at World Record Low Levels

    News   Nov 02, 2020 | Original story from the University of Helsinki

     
    De­tect­ing Gas Im­pur­it­ies at World Record Low Levels

    Periodic absorption of laser radiation in the sample gas produces an acoustic signal which can be recorded with a sensitive microphone. Credit: Teemu Tomberg.

     
     
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