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A, PLS‐DA score plot of various concentration test of nonanoyl chloride, vapour concentration: 200 ppt ~ 200 ppb, reaction time: 120 seconds, carrier gas: nitrogen. B, Differential spectrum of element 1 under 450 nm laser excitation when exposed to various concentration of nonanoyl chloride. C, Differential spectrum of element 5 under 532‐nm laser excitation when exposed to various concentration of nonanoyl chloride
