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. 2013 Jan 14;118:15–28. doi: 10.6028/jres.118.002

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 4 — The two traces show the absorbance of a 10 µmol/L solution of BODIPY^@ dye in ethanol. The solid and dashed traces were obtained for samples outside (called A₁ in the text) and inside (called A₃ in the text) the integrating sphere (IS) detector respectively. The large decrease in the absorbance for the sample inside the IS detector is due to the emitted fluorescence. The IS detector cannot distinguish between transmitted and fluorescence photons, and interprets the fluorescence photons as transmitted photons.